Joao Fonseca delivered what he described as a 'rude' response to Novak Djokovic 's comments after becoming the breakthrough star of the Australian Open. Fonseca delivered a sensational display to stun Andrey Rublev in straight sets, beating the world No. 9 7-6 (1), 6-3, 7-6 (5) in the opening round on Tuesday.

The tennis community raised their eyebrows after watching 18-year-old Brazilian star Joao Fonseca in his first Australian Open. The younger qualifier upset Andrey Rublev, the ninth-ranked player globally,

The 24-time Grand Slam champion is a master of easing into majors. At every one, he has a match that lifts him up. Will this one be it?

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.