Serena Williams and Novak Djokovic, both defending champions of their own category are through after the first round.
For Williams, this was her first tour match in four months, but she held on and came through with straight sets – 6-4, 7-5 against Italy’s Camila Giorgi.
She was broken once by Giorgi in the first set, but she returned the favor with two breaks of her own to capture the opening salvo.
Both women stayed on serve in the second set until the 11th game, when Williams won her third break of the match for a 6-5 set advantage.
The American, 34, had been struggling with a left-knee injury for months before the game, but still managed to impress by dominating 2015 with a brilliant 53-3.
Her only tournament loss had been in the US Open which denied her chance of securing four consecutive Grand Slam titles.
Meanwhile, Novak Djokovic experienced no problems on his end either with a memorable start to his title defense campaign.
The Serb outclassed South Korean star Hyeon Chung 6-3, 6-2, 6-4 in just one hour and fifty five minutes.
19-year-old Chung, whose ranking skyrocketed from 173 to 51 in 2015 proved to be no match against the current World Number One.
Djokovic had also won three of the four Grand Slams last year, conceding the French Open to Swiss Stan Wawrinka.