Aleksandra Wozniak has advanced to the second round at Wimbledon while fellow Canadian Stephanie Dubois is making an early exit.
Wozniak defeated Russian Vera Dushevina 6-2, 7-5 on Tuesday.
The Blainville, Que., native will face No. 25 seed Zheng Jie of China in the next round.
Jie came back to defeat Dubois of Laval, Que., 4-6, 6-4, 6-3 on Tuesday.
Twelve singles matches were suspended in progress and four were postponed altogether.
Milos Raonic of Thornhill, Ont., was a game from eliminating Santiago Giraldo of Colombia, leading by two sets and 5-4 in the third.
Among those that began but didn't finish, 2003 U.S. Open champion and three-time Wimbledon runner-up Andy Roddick led British wild-card entry Jamie Baker by a set and a break; and French Open finalist Sara Errani was a point from beating U.S. qualifier CoCo Vandeweghe.
The 56th-ranked Wozniak defeated Jie in the second round at the French Open. She owns a 2-0 record over Jie after winning their first match at Eastbourne three years ago.
Wozniak needed just 78 minutes to oust Dushevina, taking a 4-1 lead in the opening set and claiming the set with a winner after less than half an hour.
"Everything was going smoothly but she picked up her game at 6-2, 4-1," said Wozniak. "I was taking the ball a bit too far behind. But I was glad to finish it in two sets."
"Jie plays flat so I cannot allow her to dictate and I have to move her around if I'm going to win again."
Wozniak advanced with 17 winners to reach the second round at Wimbledon for the third time in six career appearances.
Dubois let her chances slip against Jie.
The Canadian could not hold her 4-2 lead in the second set as the Chinese pulled even at a set each after 90 minutes. The fight went out of Dubois in the third as she ended on a double-fault.
"I'm disappointed, I was very close in the second set," said Dubois, who will now return to Canada to prepare for the switch to hardcourt. "I had the momentum but it's frustrating when she takes it back. I'm not happy about that but overall it was a good match for me."
Dubois was broken eight times in the frustrating match, committing 22 unforced errors. She has been eliminated in the Wimbledon first round in four of five appearances.
In later matches, Canadian Milos Raonic faces Santiago Giraldo of Colombia while Vasek Pospisil takes on American Sam Querrey.
Kvitova, Williams notch wins
Returning to the court where she won her first Grand Slam championship a year ago, Petra Kvitova overcame a shaky start and a late rain delay Tuesday to open her Wimbledon title defence with a 6-4, 6-4 victory over Akgul Amanmuradova.
Four-time champion Serena Williams, meanwhile, returned to the same Court 2 where big sister Venus was upset a day earlier and restored family pride by beating Barbora Zahlavova Strycova of the Czech Republic 6-2, 6-4.
The fourth-seeded Kvitova fell behind 3-0 and 4-1 in the first set on Centre Court before running off seven straight games to take command against the 96th-ranked player from Uzbekistan.
After Kvitova squandered a match point at 5-3 in the second set, play was suspended and the covers rolled onto the court — the first rain break of the tournament.
When play resumed half an hour later, it took just three minutes to wrap up the match. After Amanmuradova won the first two points to hold for 5-4, the Czech player closed out the match at love, hitting a service winner and two aces and forcing a backhand error.
"It was unbelievable to come back here as the defending champion," said Kvitova, who beat Maria Sharapova in last year's final. "In the beginning I think I was nervous — first match on the grass it's always difficult to know what you can expect. I had a lot of mistakes and then I tried to play my game and go forward."
The 6-foot-3 Amanmuradova pushed Kvitova with her big serve, but lacked the consistency on her ground strokes and has now lost in the first round of all five of her Wimbledon appearances.
Following Kvitova on Centre Court was two-time champion Rafael Nadal, and he found himself in an early hole just as she had. Nadal was down 4-0 in the opening set, but roared back to beat Brazilian left-hander Thomaz Bellucci 7-6 (0), 6-2, 6-3. The Spaniard closed the match with an ace down the middle, his sixth of the day.
Nadal, coming off his record seventh French Open title, broke six times and had 35 winners and 18 errors. Having lost in last year's final to Novak Djokovic, he is bidding for a 12th Grand Slam title.
"I'm very happy to be back on the best court in the world and winning," Nadal said. "It's fantastic for me, but I have to improve a lot for the next round."
Serena Williams ground out a shriek-filled win over the 62nd-ranked Zahlavova Strycova, a day after five-time champion Venus lost her first-round match on the same court in straight sets to Elena Vesnina.
"It always has some sort of an effect," Serena said. "I always want to play even better if she's out of the tournament."
It was clear how much the match meant to the animated Serena, who screamed loudly in frustration after losing points and shouted "Come on!" and pumped her fist after winning big points.
Williams seemed to be in control after going up 3-1 and then 5-3 in the second set. But, serving for the match, she was broken back for 5-4. Williams broke again in the next game, letting out another scream after Zahlavova Strycova struck a forehand long on the second match point.
"Definitely a little relief," she said. "I was letting out a lot of cries. I was happy to get through that."
Williams, who extended her record to 13-0 in first-round matches at Wimbledon, finished with 24 winners and 12 unforced errors, compared to 17 winners and 13 errors for her opponent.
Last year, Williams questioned why tournament organizers assigned her and her sister to play on Court 2 rather than Centre Court, considering they have won a combined nine singles titles at Wimbledon. On Tuesday, she declined to address the issue.
"I can't even talk about it," she said. "I'm over it. I don't care to talk about it."
Also advancing to the second round in straight sets was No. 2 Victoria Azarenka, the Australian Open champion who beat American Irina Falconi 6-1, 6-4. Azarenka reached the semifinals at Wimbledon last year before losing to Kvitova.
In men's play, fourth-seeded Andy Murray of Britain swept to a 6-1, 6-1, 6-4 win in gloomy conditions on Centre Court over Nikolay Davydenko, a former No. 3-ranked player from Russia who has dropped to No. 47 and lost in the first round for the second year in a row. Murray, who has lost in the semifinals here the past three years, is still carrying the pressure of trying to become the first British player to win the men's title since Fred Perry in 1936.
Tsonga bounces Hewitt
Fifth-seeded Jo-Wilfried Tsonga took apart 2002 champion Lleyton Hewitt, 6-3, 6-4, 6-4. The Frenchman, who beat six-time champion Roger Federer last year to reach the semifinals, broke the Australian once in each set and never lost serve.
Hewitt has slipped to 202nd in the rankings and needed a wild card for his 14th straight appearance at the All England Club. Tsonga was too powerful, racking up 61 winners to the Australian's 12. It was Hewitt's first opening-round loss here since 2003.
Hewitt was one of four Australians in the men's draw, and all bowed out in the first round. It marks the first time since 1938 that no Australian men have reached the second round at Wimbledon.
Playing his first match since having a medical procedure on his heart, 10th-seeded Mardy Fish of the United States served 24 aces and beat Ruben Ramirez-Hidalgo of Spain 7-6 (3), 7-5, 7-6 (1) to reach the second round.
The 30-year-old Fish, who reached the quarterfinals last year, hadn't played a competitive match in 2 1/2 months after having an accelerated heartbeat. He played attacking, serve-and-volley tennis and piled up 63 winners against Ramirez-Hidalgo — at 34, the oldest man in the field.
Jarkko Nieminen ousted 14th-seeded Feliciano Lopez of Spain, 7-6 (4), 3-6, 7-6 (5), 6-4.
In early women's play, No. 12 Vera Zvonareva completed a 2-6, 7-6 (3), 6-4 win over Germany's Mona Barthel in a match that had been suspended by darkness at one set apiece on Monday.
Francesca Schiavone, the 24th-seeded Italian, came from behind to overcome 18-year-old British wild card Laura Robson 2-6, 6-4, 6-4. Schiavone, the 2010 French Open champion, received medical treatment after the first set for an apparent muscle problem. She was down 2-3 and 0-40 in the second set but saved the three break points and turned the match around against the 2008 Wimbledon junior champion.
In a men's match between two rising stars, 21-year-old Belgian wild card David Goffin — who reached the fourth round of the French Open and took a set off Federer — rallied from a set down against 19-year-old Bernard Tomic to beat the 20th-seeded Australian, 3-6, 6-3, 6-4, 6-4.
In men's doubles, Toronto's Daniel Nestor and partner Max Mirnyi of Belarus survived a scare in the first set to eventually beat Americans Michael Russell and Donald Young 4-6, 6-0, 6-2, 6-1.