There was Roger Federer, so famous for his flawless footwork, flat on his stomach, face down and motionless on the Centre Court grass after jamming the toe of his left shoe and stumbling during what turned out to be the fifth set's pivotal game in his Wimbledon semifinal.
And, a little earlier Friday, there was Federer, so successful through the years thanks in part to such a pinpoint serve, double-faulting two times in a row — What?! Really?! — while getting broken to drop the fourth set.
Two miscues of the sort you're just not used to seeing from him all that often.
Two moments that even Federer found hard to fathom.
Once seemingly on the verge of...