Serena Williams' least favorite rule made another appearance in a Grand Slam late Friday night at the Australian Open.
It took place in the opening game of the fifth set between Bernard Tomic and Alexander Dolgopolov. The young Aussie was serving for the game when Dolgopolov hit a scoop forehand that sailed toward the baseline. Tomic returned the shot, then got out of his defensive crouch, raised his racquet, looked at the chair umpire and relaxed his body, clearly signaling for a challenge. His call went unheeded and Dolgopolov, distracted by the gesture, hit a loopy forehand that went wide.
Dolgopolov immediately argued that Tomic called for a challenge and, if he didn't, the gesture should have been ruled a hindrance. The chair disagreed and the Russian went on to lose the final set, 6-2.
[Profanity warning (rhymes with "gritty") at the 0:44 mark of the video.]