Watch: Young fan asks Federer why he's nicknamed 'the GOAT'

During Saturday's US Open press conference Saturday, an inquisitive young fan asked Roger Federer why, if there isn't too much livestock in Switzerland, he's called "the GOAT."

"I don't know," Federer replied. "Some fans call me that. I don't call myself that. But yeah, we have a lot of animals in Switzerland, and goats are part of the livestock we have over there, yes."

The fan then made Federer promise to come back and play him when he goes pro.