Federer penned an emotional tribute to his longtime rival ahead of Nadal's final tournament, writing that he "challenged [him] in ways no one else could."

As the former world No. 1 prepares to hang up his racquets, here is Nadal talking tennis philosophy, finding joy through suffering, his biggest rivalries and more.

The American’s girlfriend shared her first experience at a Kansas City football game—including a skybox meeting with the pop megastar and tight end Travis Kelce.