Our Coaches

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Marcos Ondruska,CEO and Director of Tennis

Prior to Marcos's coaching career, he traveled on the ATP tour, where he reached a career-high singles ranking of #27 in the world and #34 in the world in doubles. He competed in more than 48 Grand Slams and reached the Round of 16 in the Australian Open in singles as well as the doubles semifinals. He reached three ATP tour event finals and won four doubles titles during the course of his career.

Ondruska maintains two wins over world No. 1’s and boasts additional wins over tennis legends such as Michael Chang, Brad Gilbert, Petr Korda and Wayne Ferreira. He competed on behalf of South Africa at the 1996 Olympics and played on South Africa’s Davis Cup team for eight years, where he currently serves as captain.

Click here for information on private lessons with Coach Marcos.

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Siggi Degler,
Head Coach

Siggi Degler is a German tennis coach and former professional tennis player with 22-years of tennis teaching experience. He believes that a coach has to be able to understand each player’s unique personality, technique, perception, game style, skills, and goal and character in order to get the best out of each individual.

At the age of 16 he won the German junior championship. Siggi is a graduate of Wake Forest University, where he majored in mathematical economics. During his college career, Siggi was the #1 singles and doubles player and received the outstanding male athlete of the year award in 1993 as well as all ACC honors. As a player he reached an ATP ranking of 501 winning the South East Asia doubles masters.

Siggi started his coaching career in 1998. Since then he has developed several ATP and WTA players as a tour travelling coach. Many of his players approached the top 100. He has coached at the Grand Slam level with his best player reaching as high as number 60 in the world.

Siggi was a member of the Venezuelan Davis Cup team from 2000 to 2002. From 2013 to 2016 he was also coaching at the Hofsaess Tennis Academy in Marbella, Spain. Siggi has also been the head coach of two German clubs where he was responsible for the children’s beginner program, the youth and adults club team program, as well as teaching adults of all levels. Several players he has coached have received tennis scholarships at colleges and universities in the US.

Click here for information on private lessons with Coach Siggi.

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Mary Bowen,
Director of 10 and Under and
Recreational Tennis

Mary Bowen has a true passion for teaching tennis and has taught students ranging in age from 3 thru 86. “I find I am particularly adept teaching new students but also love working with small groups of adults up to the 3.5 level.” Mary has been teaching tennis for over 11 years and was previously employed at the Little Rock Athletic Club in Arkansas before relocating to the Pacific Northwest.

Mary’s approach to teaching tennis is structured and methodical. While she emphasizes the technical aspects of stroke production she believes “ultimately, fun and enjoyment is the key to success. If my students don’t leave the court with a smile and wanting to come back, then I haven’t done my job.” With a strong background in Sport Psychology, Mary is skilled at determining the best methods to reach individual students to help them grasp a concept. Mary also has experience working with special needs children individually and in groups.

 At RTC Mary will focus on developing the 10 and U program within USTA youth progression guidelines as well as establishing a program for recreational tennis for teens and beginner adults. “Kids, especially the young ones keep me on my toes. They express things so simply and their excitement is infectious. Watching their passion grow for the sport I love keeps me coming back every day.”

Click here for information on private lessons with Coach Mary.  

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Mark Shkrebtan

Born in Moscow, Russia, Mark came to America at age three and started playing tennis by age five. He paved the way as a top-ranked junior in the Pacific Northwest before playing Division-I tennis at Seattle University, where he competed in the #1 singles and #1 doubles positions all four years.
Mark has been coaching and developing junior programs since he was 15 years old. He has coached with Scott Shogreen, Vitaly Gorin and at various facilities, including the Pro Sports Club and Central Park Tennis Club.

Click here for information on private lessons with Coach Mark.

Yevgeniy Kolomiyets

Yevgeniy was born in Kryvyih Rih, Ukraine and came to the United
States soon after. He started playing tennis at the age of 7 and has competed in the Pacific Northwest ever since. Yevgeniy currently
plays for Bellevue College where he was an NWAC conference
champion in both singles and doubles in 2019. Prior to RTC, he
coached at Columbia Athletic Clubs: Silver Lake in Everett, WA.

Yevgeniy has a structured approach to tennis that integrates
multiple aspects of the game.

Yevgeniy is a USPTA certified tennis coach. He is also certified as a personal trainer by the National Academy of Sports Medicine.