"I mean, I know some of it," he said. "Even though it's a little weird, I'm completely cool with the 15-0, 30-0, 30-15, et cetera, all the way up to 40-30. But when it gets to what's it called 'deuce'? Hell if I know. I just play then and hope the body language of my opponent or the judge clues me in to what's going on."
Coaches and friends on Tour have tried to explain the scoring system to Federer, but he says he always loses interest during their explanation.
"I thought I had it all down pretty good once," said Federer. "But then the very next tournament I went to I got into some sort of tiebreaker or something they called it? I don't know. We were changing sides of the court and they were telling me I was up 9-8 and here I thought the scoring didn't go past six. Either way, I just kept playing and playing and playing until they gave me a trophy. To this day I still don't know if the trophy was for first place or second place."
Federer insists he isn't the only player in tennis who doesn't comprehend the sport's strange scoring system.
"I was talking to Rafa [Nadal] about this very same thing the other day when we all went out bowling together," said Federer. "We are really competitive. I beat him 6-4, 4-6, 6-3, 2-6, 6-4 with a spare on my last roll. I think."