Novak Djokovic sought assistance from a trainer for some trouble breathing Friday night, and went back-and-forth with one particularly loud spectator, but when the ball was in play at the Australian Open against Tomas Machac,

Djokovic, who knows what it's like to be a tennis villain, supported the American getting the last word on a hostile Australian Open crowd.

Novak Djokovic returns to court at the Australian Open against the dangerous Tomas Machac in the third round. Djokovic, who broke one of Roger Federer’s Grand Slam records in the last round, is targeting a record 25th singles Grand Slam title with the watchful eye of Sir Andy Murray in his coaching corner.

Novak Djokovic has suggested tennis needs to embrace change, after suspecting the younger generation may be struggling to maintain their focus during long Grand Slam matches. Djokovic clashed with a spectator giving him abuse during his hugely impressive straight-sets third round win against Tomas Machac,

Novak Djokovic won in straight sets against the hecklers, too. Djokovic responded to an Australian Open fan who yelled an angry message to him after the Serbian rolled to a 6-1, 6-4, 6-4 victory over 26th-seed Tomáš Macháč.