David MacBurnie
Founder of NETRESULTS Tennis, MacBurnie has been directing high end tennis operations beginning in 1982 at the Florida Yacht Club (Jacksonville, FL). In 1990 he directed the tennis operations at the Pompano Beach Tennis Center, facilitating programming for over 65,000 members / visitors and managed 28 adult tennis teams. In 2002 he began NETRESULTS and consulted with the Tennis Programs of Harvard to revamp their curriculum and to inject a new dynamic style of instruction as our first client. Currently providing tennis managerial services to the town of Brookline for over 3,700 families at three facilities. NETRESULTS past clients include the town of Palm Beach, FL and a 41 court operation Tampa Tennis at HCC in Tampa Bay, FL. At their peak in 2017, NETRESULTS Tennis provided services to over 7,000 families on the east coast. David is a certified USPTA Elite Professional since 1986, a USTA High Performance Coach and former top 10 US 35’s. MacBurnie played collegiately tor Rollins College (Winter Park, FL). David was a USTA National 35’s Team Champion (Florida), a 5 time Men’s 45’s Atlantic Coast Cup Team Champion (NE) and a 4 time New England Men’s 50/60 Sectional singles champion.
Geoff Jagdfeld (Executive Director)
Geoffrey Jagdfeld epitomizes passion, expertise, and visionary leadership in racquet sports. With a Bachelor of Science in Exercise Physiology from Michigan State University, Geoffrey has built a career marked by innovation and impact. Geoffrey has held key roles in prestigious organizations such as the USPTA and USTA. As President of USPTA Eastern, his strategic leadership elevated the organization, driving initiatives that reshaped tennis education and engagement. At the USTA, he expanded junior tennis programs and fostered community relationships. His influence extends to club management, where as General Manager of New Canaan Racquet Club and HALO Fitness, he spearheaded initiatives that enhanced community engagement and boosted membership. As Director of Tennis at Solaris Sports Club, he introduced pioneering programs like USTA Jr. Team Tennis leagues, revitalizing tennis participation. Geoffrey’s contributions have been recognized with awards including the USPTA Eastern Industry Excellence Award and USTA Eastern Tennis Professional of the Year. His certifications from USPTA, PTR, and USTA underscore his commitment to professional mastery. Geoffrey Jagdfeld continues to inspire and innovate, shaping the future of racquet sports through strategic partnerships and player engagement initiatives.
David Mulas (Senior Staff)
Introducing David Mulas Zelenskaya, a seasoned tennis professional with a passion for the game and a keen interest in the dynamic world of marketing. As an international student, David brings a unique perspective and a wealth of experiences to the tennis court and beyond. With a strong foundation in tennis, David has honed not only his skills on the court but also his leadership abilities. He was named team captain for the 2022-2023 regular season, where he led his team with dedication and determination, fostering a culture of excellence and teamwork. Now, as a tennis teaching professional with NETRESULTS, David is excited to share his love for the game and his expertise with aspiring players of all levels. His experience as a player and leader informs his approach to coaching, where he prioritizes not only skill development but also mentorship and personal growth. Join David in the exciting journey of tennis and marketing! Whether you’re looking to improve your game or enhance your marketing efforts, he’s here to guide and support you every step of the way. Let’s connect and embark on this thrilling adventure together!
Caleb Slotnick (Senior Staff)
Caleb is a valued member of the NETRESULTS team and has been an integral part of our coaching staff for over five years. A dedicated teaching professional, Caleb has made a lasting impact on the Brookline tennis community through his passion, consistency, and commitment to player development. Caleb’s love for tennis began early, playing with his family and continuing to grow throughout his college years, where he often hit the courts with friends as a fun and effective way to relieve stress. Today, Caleb brings that same joy and energy to every lesson, combining his enthusiasm for the game with a desire to help others improve and enjoy tennis as much as he does.
Rodrigo Araujo (Senior Staff)
Rodrigo’s passion for tennis began at age eleven when he started assisting his four uncles with lessons. With over a decade of coaching experience and a strong foundation built through family mentorship, he brings energy, dedication, and a thoughtful approach to every session. A recent graduate with a degree in Management, Rodrigo blends strategic insight with his love for the game to help players develop both on and off the court. His teaching style emphasizes fundamentals, fun, and continuous improvement—whether working with beginners or competitive athletes. Rodrigo is committed to growing as a coach and sharing his enthusiasm for tennis with every player he meets.
Tommy Lay (Senior Staff) 
Originally from Cambodia, Tommy embarked on a journey to the US to pursue his education, but along the way, he discovered his passion for tennis and fell in love with the sport.During his high school years, Tommy made a mark on the USTA Circuit 18’s, clinching the USTA Mayors Cup Championship in 2000. His talent and dedication led him to compete as the #2 player at the University of Massachusetts Boston for three years, followed by two years on the USTA professional circuit. Tommy’s commitment to tennis extended beyond his own playing career. In 2000, he became a volunteer with Tenacity and the USTA 10 and under program, earning certification in 2001. Over the years, Tommy served as the head tennis pro with Tenacity for Summer and School year programs for eight years and as a Senior tennis pro at Harvard Tennis Academy for three years. With a wealth of experience and a passion for coaching, Tommy joined NETRESULTS, where he has served as the Director of Jr Developmental summer program and a senior staff professional. Tommy enjoys working with players of all levels, specializing in the Developmental program with notable success. His ultimate goal as a teaching pro is to nurture young players, igniting excitement in his students with the hopes of developing future champion players.Tommy is thrilled to continue his partnership with NETRESULTS Tennis in 2019 and beyond, dedicated to providing the best tennis experience to players of all ages in Brookline.
Will O’Brien (Senior Staff)
Will O’Brien is originally from Upstate New York, where he grew up playing competitive junior tournaments before continuing his career at Fairfield University. Over the past seven years, he has taught tennis in East Hampton and Saratoga Springs, working with players of all ages and skill levels. Now teaching part-time, Will brings both experience and enthusiasm to the court, with a passion for helping players improve and enjoy the game. Will recently got to the doubles semi finals of the Men’s Open Grass Court Championships that was hosted at the Tennis Hall of Fame.
Luis Platas (Senior Staff)
NETRESULTS proudly presents Luis Platas, an accomplished Tennis Coach with a passion for elevating players to new heights of skill and performance. Luis holds a Bachelor’s Degree in Psychology with a minor in French from Kenyon College, where he honed his understanding of human behavior and communication, vital skills for effective coaching. Luis is the Assistant Coach, Kenyon College Men´s and Women´s Tennis Teams and was a 4 year standout as a varsity player at Kenyon. As a collegiate athlete, Luis excelled on the court, earning accolades such as Newcomer of the Year. He showcased his talents in both singles and doubles, often competing in the top positions. Luis’s role involves analyzing player skill and fitness levels to tailor training programs. He supports the Head Coach in various aspects, including recruitment, lesson planning, and budget management. With a rich background in competitive play and extensive coaching experience, Luis Platas is dedicated to helping you achieve your tennis goals. Join him on the court and experience the NETRESULTS difference today!
Bobby Harding (Senior Staff)
Bobby Harding is a dedicated tennis professional with over five years of experience coaching at leading facilities across the South Shore. Since joining the NETRESULTS – Smash Tennis Boston team, Bobby has brought his trademark energy, enthusiasm, and expertise to the court, quickly becoming a valued leader within the Young Stars Camp program. With more than a decade of youth sports coaching experience, Bobby excels at creating a fun, supportive environment where young players can learn, grow, and develop a love for the game. Known for his approachable personality and ability to connect with players of all ages, Bobby is committed to helping every child reach their full potential—both on and off the court.
Sujit Chepuri (Senior Staff)
Originally from Minnesota, Sujit Chepuri began his tennis journey as a competitive junior and standout high school player. He helped lead his team to multiple state championships while also achieving individual success in junior competition. His passion for the sport continued at Amherst College, where he competed as a four-year starter in both singles and doubles.Sujit’s coaching career began in high school, working summers at country clubs in the Twin Cities during 2019, 2020, and 2021. He quickly developed a love for teaching players of all ages, from children just learning the game to adults refining their skills. Since then, Sujit has guided the development of several competitive juniors and recently joined the coaching team at NetResults in Boston, where he continues to share his enthusiasm and knowledge for the game.
Pitu Martinez (Senior Staff)
Born in Madrid, Spain, Pitu Martinez has been immersed in tennis since the age of four. She began her playing career at the prestigious David Lloyd Club in Spain before continuing her development at the Emilio Sánchez Academy in Naples, Florida. Pitu went on to compete for Louisiana State University of Alexandria, excelling in both singles and doubles and serving as captain of the women’s tennis team. Following graduation, she returned to the Emilio Sánchez Academy as a full-time coach, where she spent 1.5 years training players of all ages and levels—ranging from children just starting out to competitive juniors and adults.Today, Pitu brings her international experience, leadership, and passion for the game to every lesson she teaches.
Ali Al-Sabbagh (Senior Staff)
Ali Al-Sabbagh brings a unique combination of teaching experience, community leadership, and passion for player development to the NETRESULTS coaching team. A Boston native, Ali has worked with youth and adults across the city for over a decade, including roles at Sportsmen’s Tennis Club and Edu Sports, where he created curriculum-based lesson plans and led summer camp programs for Boston Public Schools students. Ali’s teaching approach emphasizes patience, structure, and clear communication—skills he honed both on the court and in the classroom as a substitute teacher with Boston Public Schools. His focus on skill progression, sportsmanship, and creating a fun, supportive learning environment helps players of all levels build confidence and consistency. In addition to his tennis background, Ali has served in community-based roles promoting education, inclusion, and volunteerism, both locally and abroad. He holds a Bachelor of Liberal Arts in Africana Studies from the University of Massachusetts Boston. When he’s not coaching, Ali enjoys mentoring young people, volunteering, and staying active in Boston’s recreational and educational communities.
Cameron Crane (Seasonal Staff)
Cameron began his coaching journey in 2020 under the mentorship of Geoff Jagdfeld in Westchester, NY, following years of playing under his leadership. A passionate player from a young age, Cameron discovered his love for tennis through local group clinics and went on to compete as a student-athlete at Worcester Polytechnic Institute (WPI). He is currently pursuing his master’s degree at Northeastern University. Cameron brings energy, strategy, and a love for teaching to every lesson. Whether working with beginners or seasoned players, he’s committed to helping others grow and making tennis a fun, lifelong learning experience.
Nicola Bacella (Adult Head Professional) 
Hailing from Argentina, Nicolás Bacella is a graduate student at Saint Leo University, where he is pursuing a Master’s degree in Data Analytics following his undergraduate studies in Management.Nicolás’s passion for tennis is evident both on and off the court. As a key member of the Saint Leo Tennis team, he currently competes in spot #3 singles and #2 doubles, contributing to the team’s impressive ranking as #1 in the country in D2. With a noteworthy tennis career, Nicolás has earned 2 ATP points in singles and 6 in doubles, showcasing his talent and dedication to the sport. Beyond his achievements as a player, Nicolás has also dedicated over five years to teaching tennis to individuals of all levels and ages in locations such as Buenos Aires, Norwalk, Tampa, and New Hampshire. His greatest joy lies in witnessing the progress and improvements made by his students on a daily basis. Driven by a love for new challenges, Nicolás is eagerly anticipating a rewarding summer at Amory, where he looks forward to sharing his passion for tennis and continuing to inspire others to reach their full potential on the court.
Camila Keller (Seasonal Staff)
Camila brings three years of coaching experience to the table, catering to players of all skill levels – from beginners to advanced. Her enthusiasm for the game is infectious, and she’s dedicated to helping every player she coaches reach their full potential. As a student-athlete from Argentina, Camila proudly represents Saint Leo University Women’s tennis team and embodies the spirit of perseverance and excellence. Pursuing a BA in Business Economics at Saint Leo University, Camila is on track to graduate in May 2026. Her educational journey began at Escuela Evangelica Dr. Federico Jorge Hotton in Buenos Aires, Argentina. Camila Keller is a valuable addition to the NETRESULTS coaching team, bringing energy, expertise, and a genuine love for tennis to every session. Get ready to elevate your game with Camila by your side!