Partner Coaches: Olaso Tennis

Keff Lester Gamana

Hailing from the Philippines, Keff is a tennis coach with over a decade of experience developing young talents and elite athletes. His passion for the sport and commitment to excellence have taken him beyond local borders, including a two-year stint with the Bahrain Tennis Federation.
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There, he played a key role in coaching junior players in the under-10, under-12, and under-14 categories, while also contributing to the training of national representatives on the Davis Cup and Fed Cup teams. Keff’s well-rounded coaching background reflects his ability to connect with players of all levels and inspire them to reach their full potential.

Guillermo Olaso

Originally from Bilbao, Spain, Guillermo Olaso is a former professional tennis player who reached an impressive career-high ATP world ranking of No. 160. Over the span of his 10-year career, he competed in all four Grand Slam tournaments—Wimbledon, Roland Garros, the US Open, and the Australian Open—and secured 23 professional titles along the way.

Since transitioning to coaching, Guillermo has brought his wealth of experience to players at all levels, from amateurs to ATP professionals, with coaching stints in both Singapore and New York. His deep understanding of the game and global perspective make him a valuable mentor on and off the court.

Jeson Patrombon

Jeson Patrombon is a professional tennis player from the Philippines with a career-high ATP singles ranking of 869, achieved on August 13, 2012, and a doubles ranking of 1063, reached on October 5, 2015. A dedicated competitor, he has claimed an ITF doubles title and proudly represented the Philippines in the Davis Cup, where he holds a win-loss record of 5–4.

On the regional stage, Patrombon has brought honor to his country with a gold medal at the 2019 Southeast Asian (SEA) Games and a silver medal in 2021. His journey reflects both skill and national pride, making him a standout figure in Philippine tennis.

Junjie Guadayo

Junjie is a passionate and dedicated tennis coach whose love for the sport is matched by his commitment to both personal growth and the development of his students. While he remains focused on delivering the best training experiences—rooted in strong fundamentals and competitive readiness—he also leads by example by staying fit and maintaining a competitive mindset.

Over the years, Junjie has actively competed in various tennis tournaments across Singapore, earning notable achievements, including a championship title at the 2019 STA Pesta Sukan Open/Masters Tennis Championships in the Men’s 35+ Doubles category. He has also consistently reached the semi-finals in the Mixed Open Doubles category since 2018, proving that his passion for the game extends far beyond the coaching court.

Gerome Patrombon

Gerome Patrombon is an Australasian Academy of Tennis Coaches (AATC) Certified Tennis Coach with a rich and well-rounded background in both competitive play and athlete development. A former standout of the San Beda University Tennis Team, he played a pivotal role in securing multiple National Collegiate Athletic Association (NCAA) and Inter-University Championship titles. Gerome also represented the Philippines on the international stage as a member of the National Soft Tennis Team, earning a gold medal in doubles at the Kota Kinabalu Tournament.
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Beyond his accomplishments as a player, Gerome brought his leadership and technical expertise to the Philippine Coast Guard Tennis Team, serving as a playing coach. There, he excelled in inter-government agency tournaments across the country while further honing his skills in coaching strategy and athlete mentoring. His extensive experience and passion for tennis make him a dynamic and inspiring figure in the sport.