Tennis star Roger Federer has long been considered one of the good guys insports. A recent Twitter post by a young fan, however, takes Federer's sainthood to a whole new level.

The fan's name is Beatriz Tinoco. She's 17 years old, from Rockville, Md., and survived a battle with cancer in 2011 and 2012. Earlier this summer, she got an opportunity to meet Federer at Wimbledon through the Make-A-Wish Foundation. But Federer didn't just perform a perfunctory handshake and sign a few things. He went way, way above and beyond the call of duty, as Beatriz detailed onTwitter Tuesday afternoon.