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World number one Novak Djokovic cruised through to the second round of the Australian Open after a straight sets, 6-3 6-2 6-4, win over South Korea’s Hyeon Chung.
Djokovic is bidding to equal Australian Roy Emerson's record of six Australian Open crowns and he was thrilled with his start to the tournament.
"It's an absolute pleasure to come back to Rod Laver Arena, it's the most successful court in my career and there have been many memorable moments in the matches I've played here," Djokovic said.
The Serb will be joined in the second round by Roger Federer after the Swiss star defeated Nikoloz Basilashvili 6-2 6-1 6-2.
Czech sixth seed Tomas Berdych and Japan's seventh seed Kei Nishikori both eased into the second round with straight-set wins, while Australia's Nick Kyrgios beat Pablo Carreno Busta of Spain 6-2 7-5 6-2.
In the women’s draw, defending champion Serena Williams battled to a convincing 6-4 7-5 win over Camila Giorgi to book her place in the second round in her first tour match for four months.
Williams had not played a competitive match since the US Open in September, but she showed all her class and battling qualities to seal a straight sets win.
"It's great," Williams said, when asked about her knee injury. "It was an hour and 43 minutes and I didn't feel it at all."
"I just needed a break," she said.
"I have been going non-stop since the Olympics in London, and seeing that this is another Olympic year, I wanted to start the year out really fresh and really go at it again as hard as I can."
Sixth seed Petra Kvitova was the first player to win a match at the tournament, beating Thailand’s Luksika Kumkhum 6-3 6-1.
However, there was a major shock when former world number one Caroline Wozniacki, the 16th seed, was knocked out 1-6 7-6 6-4 by world number 76 Yulia Putintseva.
The Dane is yet to win a major and she was disgusted with her early exit in Melbourne.
“I would say it’s a pretty shitty start to the season,” Wozniacki said.
“It wasn’t a pretty first set but I got it done and really should have closed it off in two.
“You know, I let her back into the match, and it was basically my own fault that I’m not here as the winner.”
Wozniacki wasn’t the only seed to be knocked out in the opening round, with Italy’s Sara Errani, the 17th seed, losing 1-6 7-5 6-1 to 21-year-old Russian Margarita Gasparyan.
She was joined in defeat by American Sloane Stephens who went out 6-3 6-3 to Chinese qualifier Wang Qiang.