Canada's Aleksandra Wozniak reached the second round of the U.S. Open with a 6-0, 6-3 win over Romania's Alexandra Cadantu on Monday.

The 48th-ranked Wozniak, a quarter-finalist last week in a Dallas tune-up event, needed little more than an hour to advance after losing four of her last five opening matches at Flushing Meadows.

The Blainville, Que., native swept the first set with ease in less than half an hour against Cadantu, who suffered a 6-0, 6-0 first-round loss to Maria Sharapova at the French Open this year.

Canadian content on Tuesday

Milos Raonic of Thornhill, Ont., will start his men's campaign against Colombian Santiago Giraldo on Tuesday.

Raonic will try and reach the quarter-final stage of a Grand Slam for the first time in his career.

Doubles ace Daniel Nestor of Toronto and partner Max Mirnyi of Belarus will open against Americans Steve Johnson and Jack Sock.

The second set was more competitive, with Wozniak recovering from an early breakdown before winning the match on a third match point.

"Overall, it was the first solid match for me here," said Wozniak, who had to deal with a two-hour rain delay. "The first set went fast and then there was a long bathroom break for her.

"She started putting more balls in during the second set. I'm glad I stayed on top or her and won this one. It was nice that it went so fast after the long rain delay. It was so crowded in the locker-room, the lounge, the cafeteria."

Wozniak made it to the third round in 2009.

She will next play No. 15 seed and good friend Lucie Safarova of the Czech Republic, who routed one-time Open quarter-finalist Melanie Oudin of the U.S. 6-4, 6-0. Safarova has a 2-1 edge in career meetings against Wozniak.

Back at the site of her greatest victory, Samantha Stosur looked like a champion again, not the player who has often struggled this year.

The Australian began the defence of her Open title with a dominant win, needing 51 minutes to beat 64th-ranked Petra Martic 6-1, 6-1 in the tournament's first match at Arthur Ashe Stadium before rain suspended play for more than two hours.

The last time Stosur played on this court, she stunned Serena Williams in the 2011 final at Flushing Meadows for her first Grand Slam title. But in so many ways, that 6-2, 6-3 victory was starting to feel as if it happened much more than a year ago.

Stosur lost in the first round in front of the home fans at the 2012 Australian Open. She lost in the second round at Wimbledon, then again in the first round at the London Olympics.

Against Martic, who withdrew from the Olympics with a left foot injury, Stosur won the first 19 points, five away from a golden set, before the streak ended on a double-fault.

"It pops into your head and you think, `Oh, that would be cool,"' Stosur said of winning a set without dropping a point.

She was still nearly perfect, with 22 winners and 10 aces. She didn't face any break points.

Top-seeded Victoria Azarenka needed only 50 minutes to defeat Alexandra Panova 6-0, 6-1.

Azarenka, the Australian Open champion, is trying to become the first top-seeded woman to win a Grand Slam tournament since Serena Williams captured the Wimbledon title in 2010.

Azarenka has never been past the fourth round at Flushing Meadows. She had 20 winners to only two for Panova, the 76th-ranked Russian who is still in search of her first win in the main draw of a Grand Slam.

Four-time Grand Slam champion Sharapova advanced to the second round with a 6-2, 6-2 win over Melinda Czink.

The third-seeded Russian needed just 67 minutes to beat the 88th-ranked Hungarian left-hander.

Sharapova won the French Open to complete the career Grand Slam and an Olympic silver medal this year but pulled out of hard-court warm-up tournaments in Montreal and Cincinnati because of illness.

Sharapova had 24 winners to eight for Czink, who has reached the third round of a major tournament three times.

Kim Clijsters began the last tournament of her career by winning her 22nd consecutive U.S. Open match, beating 16-year-old American wild card Victoria Duval 6-3, 6-1 Monday night. T

The 29-year-old Belgian has left Flushing Meadows with the title each of the last three times she played — in 2005, 2009 and 2010. She missed the Grand Slam tournament in 2011 because of an injured stomach muscle.

Duval, who is based in Bradenton, Fla., was making her tour-level main-draw debut after earning a berth by winning the under-18 U.S. national championship.

Duval actually led 3-2 after 13 minutes Monday. But Clijsters quickly gained control and won 10 of the last 11 games.

Ninth-seeded Li Na reached the second round for the first time since 2009, beating Britain's Heather Watson 6-2, 6-3. She's coming off a victory in Cincinnati, her first title since the 2011 French Open.

Li was a top-10 seed when she lost in the first round at Flushing Meadows in each of the previous two years.

Marion Bartoli of France, seeded 11th, defeated American Jamie Hampton 6-3, 7-6 (5), and 19th-seeded Nadia Petrova of Russia advanced with a 6-3, 7-6 (3) win over Jarmila Gajdosova of Australia.

It was a rough first day for the German women, with 16th-seeded Sabine Lisicki and 18th-seeded Julia Goerges both losing.

Men's draw

Top-seeded Roger Federer returned to the U.S. Open on Monday and defeated Donald Young 6-3, 6-2, 6-4 to improve his career record to 62-7 at Flushing Meadows.

Looking to extend his record with an 18th Grand Slam title, Federer finished with seven aces and needed only 1 hour, 34 minutes to dispatch Young, an American who endured a 17-match losing streak earlier in the year.

Federer, winner earlier this year at Wimbledon and the Olympic silver medalist, came into the U.S. Open seeded first for the 23rd time at a Grand Slam, breaking the record he shared with Pete Sampras. Federer had left the U.S. Open the last two years after semifinal losses to Novak Djokovic.

Seeking that elusive first Grand Slam title, Andy Murray began his U.S. Open campaign with a straight-set victory over Alex Bogomolov Jr. that included some hairy moments. The Olympic gold medallist overcame early breaks in the first two sets of a 6-2, 6-4, 6-1 win.

The third-seeded Murray won the final five games of the first set and the last four games of the second after falling behind early against the 73rd-ranked Bogomolov.

Murray, who won the gold medal in his home country at the London Games, also reached the final at Wimbledon.

The American men got off to a good start with wins by two wild cards, 32-year-old James Blake and 19-year-old Jack Sock.

Sock took a two-set lead over Florian Mayer before the No. 22 seed quit after feeling faint and dizzy. Sock won the U.S. Open boys championship in 2010, becoming the first American to take that title since Andy Roddick, 10 years earlier. He came into this year's tournament ranked 248th and without a win over a top-50 player.

Sock was ahead 6-3, 6-2, 3-2 when Mayer retired.

Blake reached the second round of a Grand Slam event for the first time this year, beating Lukas Lacko 7-5, 6-2, 3-6, 6-3. He had needed a wild card to make his 12th appearance at the Open after his ranking fell out of the top 100. He hadn't lost in the first round at Flushing Meadows since his debut in 1999.

Blake, who has twice made the quarter-finals at the Open, won the first two sets against the 54th-ranked Lacko before the rain delay.

No. 23 Mardy Fish beat Go Soeda of Japan in three sets, and Tim Smyczek won 1-6, 6-4, 6-2, 4-6, 6-4 over Bobby Reynolds in a 3-hour, 33-minute, all-American matchup between qualifiers.

With files from The Canadian Press