Our Coaches


Marcos Ondruska

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.


Jack Streeter

Jack Streeter grew up in London and began playing tennis at eight years old. After thriving at the high-performance level himself, Jack has firsthand knowledge of what it takes to reach your highest potential and recognizes how striving for excellence can shape your character and way of life. He embraces cross training and believes it's key in becoming a better athlete.

Jack is extremely passionate with what he does, and wants to help you reach your goals, on and off the court.


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.


Henry Barkhudariyan

Henry was born in Kirkland, Washington and started playing tennis at four years old. He spent the entirety of his junior tennis career playing at the high-performance level and graduated from Bellevue High School in 2014, where he led the varsity team to win two state championships.

Henry has coached high performance programs in various clubs on the Eastside. In addition to coaching, Henry is extremely passionate about helping out in his community. He has been an avid volunteer with the Bellevue School District, where he started an after school tutoring program. 


Anton Saranchukov

Anton was born in Almaty, Kazakhstan and started to play tennis at age 5. He's traveled the world to play various professional events, including ITF tournaments and $15,000-$50,000 futures and challengers.

He's practiced with Justine Henin, Dmitry Tursunov, Andrey Golubev and other well-known ATP and WTA professionals. He moved to the U.S. in 2012, where he began coaching at Redmond Tennis Club and Bellevue Tennis Academy.


Rudolf Kischel

Rudolf's coaching career started in Latvia as the head coach at Tennis Club Dynamo, where three of his students became members of the national Latvian team. After moving to the U.S., Rudolf worked as a high school tennis coach for 10 years. He also ran a private tennis school where many of his students developed to become nationally ranked junior and collegiate players.

Rudolf is a certified tennis USPTA and PTR tennis instructor and currently runs the Dot Excellence program at RTC. With 38 years of experience, Rudolf has developed a teaching style that rapidly creates high-level junior players.

Maggy Lehmicke

Maggy is a Seattle native who started playing tennis at age 11. She eventually competed on the Nebraska women's tennis team for four years, where she started her sophomore year with a pre-season ranking of #63 in the country. She captained the team and competed in the #1 singles position, as well as #1 and #2 doubles positions, for the next three years.

Maggy has been coaching on-and-off since high school and now coaches both adults and juniors at RTC. In addition to coaching, Maggy is also the publisher and editor of Northwest Tennis Magazine, a regional tennis publication that she launched September 2017.


Mukul Karthikeyan

Mukul Karthikeyan was the 2017 Professional Tennis Registry's (PTR) Tennis Coach of the Year in India. Before joining RTC, Mukul coached at tennis academies such as Van Der Meer Tennis University in South Carolina and the Lucky Tennis School in Taizhou, China where he coached the Shanghai Pudong Provence Junior Team.

 In addition to his academy experience, Mukul has worked as a traveling coach to top-ranked Indian players at both national and ITF junior circuits. Mukul also coached alongside tennis greats such as Yu Liqiao (former coach of Li Na) and Chen Hao, the coach of the Chinese National Junior Team. He is GPTCA ATP Level C Certified, a PTR 2A Professional, and a PTR Adult Development Professional. Mukul is available for private lessons at RTC and teaches all levels of group classes at the club as well.