All it took was a couple of questionable calls for Novak Djokovic to snap at the chair umpire in the second game of his third-round match at Wimbledon.
"That's two points in a row at the beginning of the match," Djokovic said, before telling official Jake Garner: "Focus, please!"
That would have been good advice for Djokovic himself. Maybe he was a bit on edge because this was the stage at which, as a two-time defending champion, he lost at the All England Club a year ago. On Saturday, Djokovic briefly fell behind by an early break before zipping past Ernests Gulbis of Latvia 6-4, 6-1, 7-6 (2) to earn his 10th berth in the tournament's second week.