In Houston, young rising Americans Frances Tiafoe, Ernesto Escobedo, Reilly Opelka and Jared Donaldson paid it forward by participating in Kids Day. Not far removed from being kids themselves, the quartet of young Americans enjoyed their time with the hopeful future stars.

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"It's a lot of fun," 20-year-old Donaldson said. "I think it's a really great way to grow the sport and get a lot more kids, and even parents, interested in tennis. Hopefully it causes a lot more players to pick up the game..."