SEATTLE, WA - APRIL 29: Roger Federer of Switzerland warms up at the Match For Africa 4 exhibition match at KeyArena on April 29, 2017 in Seattle, Washington. (Photo by Suzi Pratt/Getty Images)
SEATTLE, WA - APRIL 29: Roger Federer of Switzerland warms up at the Match For Africa 4 exhibition match at KeyArena on April 29, 2017 in Seattle, Washington. (Photo by Suzi Pratt/Getty Images)