MELBOURNE, Australia — Rafael Nadal has missed a lot of tennis since last September. He hasn't missed a beat.

The No. 2-seeded Nadal had a 6-4, 6-3, 7-5 win over Australian wild-card entry James Duckworth on Monday in the first round of the Australian Open, his first match back on Rod Laver Arena since he had to retire in his quarterfinal match last year.

The 17-time major winner hasn't played since retiring from his semifinal at the US Open because of a knee injury, and then had surgery on his right ankle in November. He withdrew from a warm-up tournament in Brisbane in the first week of the season because of a muscle strain in his thigh.

"Not easy to come back after a lot of months of competition, especially against a player playing super aggressive every shot," Nadal said. "It's very difficult to start after an injury — I know it very well. It's very special to be back." Wearing a sleeveless top, he showed no signs of any issues against Duckworth. His only hiccup came when he served for the match in the ninth game of the third set and was broken at love. He returned the favor very quickly, though, to seal his spot in the second round.

Nadal has only lost twice in the first round at Grand Slams — to Steve Darcis at 2013 Wimbledon, and to Fernando Verdasco here in 2016 — and is aiming to be the first man in the Open era two win all four majors at least twice.

Maria Sharapova has the second-best record among active women's players in first-round matches at the majors, and she gave an illustration of why that's the case with a ruthless 6-0, 6-0 win over Harriet Dart.

The 2008 Australian Open champion got play started on Rod Laver Arena and needed only 63 minutes to advance.

In her 15th trip to Melbourne Park and her 55th Grand Slam tournament, she's acutely aware of the toll that the sun and long early matches can have on a player's title ambitions, so she gets straight to business.

The 22-year-old Dart, playing in the main draw of a major for only the second time after getting a wildcard to play last year at Wimbledon, only got a look at one break point in the match — when Sharapova served a double-fault in the second set. She got seven of her 29 points from Sharapova's double-faults.

Sharapova said she was still feeling pain in her right shoulder despite sitting out the end of last season after the US Open.

Stung by a first-round loss at Wimbledon last year, Sharapova said she couldn't afford to feel any empathy for Dart.

"I mean, there is no time for that, I'm sorry to say ... when you're playing the first round of a Grand Slam," she said. "I think I was just focused on not having a letdown.

"I think it's very easy to be in a position where things are flowing, you know, you're doing all the right things, she's making a few errors, you're comfortable, easy to get complacent, and, you know, complacency is not great. I was glad that I did the right things from the beginning till the end." Up next for Sharapova is Rebecca Peterson, who beat Sorana Cirstea, 6-4, 6-1.

Also advancing were 2017 U.S. Open champion Sloane Stephens, No. 11 Aryna Sabalenka, No. 19 Caroline Garcia, No. 29 Donna Vekic and No. 31 Petra Martic.

Danielle Collins advanced to the second round of a major for the first time following a 2-6, 7-6 (5), 6-4 win over No. 14-seeded Julia Goerges, who won the title in Auckland to start the season.

Katie Boulter earned the distinction of winning the first 10-point tiebreaker under the Australian Open's new system for deciding sets.

Boulter beat Ekaterina Makarova 6-0, 4-6, 7-6 (6), including 10-6 in the tiebreaker. The new rule was introduced to ensure matches don't get too lengthy — previously the third set in women's matches and the fifth set in men's matches at the Australian Open had to be decided by a two-game advantage.

Fifth-seeded Kevin Anderson won his first match at Melbourne Park since 2015 when he beat Adrian Mannarino 6-3, 5-7, 6-2, 6-1. Also advancing on the men's side were No. 19 Nikoloz Basilashvili and No. 26 Fernando Verdasco.

Defending champions Caroline Wozniacki and Roger Federer were scheduled to play night matches later Monday.