Age: 26

Nishikori is the No. 6 tennis player in the world. He is the only Japanese pro to ever break the ATP Top 10 and the first Asian athlete to make a men’s Grand Slam final. Nishikori earned $33.5 million almost entirely in endorsement deals; his 15 sponsors include Wilson, Adidas and Jaguar. His contract renewal with Japanese apparel brand Uniqlo is worth tens of millions annually.