NEW HAVEN, Conn. -- Caroline Wozniacki found another way to win at the New Haven Open, where she has lost just one match in six years. The fourth seed advanced to the second round Monday when Peng Shuai was forced to retire while up a set on the four-time tournament champion. Peng was leading 6-2, 1-3 when the chair umpire announced the Chinese player could not continue due to illness. Tournament officials later said she was suffering from dizziness. Peng, who has a history of heart problems, spent an extended time with a trainer after Wozniacki asked for a coach while leading 3-0 in the second set. WTA officials said Peng was examined by medical personnel after the match, but had no further details. The 27-year-old pursued a pro tennis career despite having heart surgery when she was 12 years old. Her ordeal was the subject of an Adidas advertising campaign, "Impossible is Nothing." "She felt a bit dizzy and obviously from the flight and everything, she played the doubles finals in Cincinnati last night," Wozniacki said. "Flying in here and having to play the same day is obviously tough." Peng broke Wozniacki twice in the first set. But Wozniacki seemed to turn things around in the second game of the second set, which included seven deuces and Peng holding an advantage five times. "I just kept playing," she said. "I tried not to think about the score too much, because with her, you never know. I just really thought, One point at a time." Wozniacki, seeded fourth in the tournament, improved to 21-1 in her six years in New Haven. Her only loss here came in last years semifinals when she retired due to a knee injury. "Its a great tournament for me, what else can I say," she said. "Its my sixth time here. Its ridiculous." Earlier, American Sloane Stephens beat Anna Schmiedlova of Slovakia 6-4, 6-4. The sixth-seeded Stephens, the top-ranked American in the draw, broke Schmiedlova in the third game of the match, while reeling off 13 straight points. The two traded breaks in the second set until Stephens held serve to go up 4-2. She will play German Julia Goerges in the second round. Goerges advanced with a 6-2, 4-6, 7-5 win over Bojana Jovanovski of Serbia. Stephens, who beat Serena Williams to reach the semifinals of the Australian Open in January and made the quarterfinals of Wimbledon in July, came into the match ranked 17th in the world. Two years ago, she came into New Haven ranked 110th and lost in qualifying. Stephens said shes been able to stay grounded with the help of some friends, including tennis legend Billie Jean King, who sends her texts before every big match. "She says, Pressure is a privilege," Stephens said. "I think its one of the strongest statements Ive heard." Fifth-seeded Roberta Vinci of Italy was the tournaments first upset victim, losing 7-5, 6-3 to Carla Suarez Navarro. The Spaniard will next play Romanian Simona Halep, who beat Daniela Hantuchova of Slovakia, 6-2, 6-1. The 21-year-old Halep has already won three tournaments this year and is coming off an appearance in the quarterfinals in Cincinnati, where she lost to the top-ranked Williams. Halep feels shes peaking at the right time. "My game its very good now; I have more confidence in me," she said. "I have to enjoy (next weeks) U.S. Open, because at the Grand Slams, I didnt play so well this year." Eighth-seeded Dominika Cibulkova of Slovakia, ranked 19th in the world, also lost. She was beaten by Klara Zakopalova of the Czech Republic 3-6, 6-3, 6-3. Ekaterina Makarova downed Montreals Aleksandra Wozniak 6-2, 2-6, 7-6 (5). Other winners Monday included Russians Anastasia Pavlyuchenkova and Elena Vesnina, Mayo Hibi of Japan, qualifier Monica Puig of Puerto Rico and Karin Knapp of Italy. Defending champion Petra Kvitova was to play Polands Urzula Radwanska in the final match of the day. But Radwanska was forced to withdraw with what was described as a viral illness and was replaced by Annika Beck of Germany. The match was then postponed a day because of rain, which also delayed the start of the Peng-Wozniacki match by two hours. Kvitova, who has made the quarterfinals of the last three events she played, is using this tournament to help prepare for the humidity in New York next week, which she says wreaks havoc with her asthma. "I never like playing in America, because of my asthma," she said. "But last year I played quite well, I won two titles, so it was a pretty good year, so I know that I can play good here." Tom Glavine Jersey . 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Kadri was dressed in a green jersey at Thursdays practice and skated as an extra forward on the teams fourth line as the Leafs.. Kadri was handed a three-game suspension by the league for his hit to Minnesota Wild goaltender Niklas Backstrom during Wednesday nights game. Kadri was also assessed a match penalty later in Wednesday nights game for a hit to the head of Wild forward Mikael Granlund. James van Riemsdyk lined up between Phil Kessel and Mason Raymond at Leafs practice on Thursday. Jay McClement moved up to the second line, centring Joffrey Lupul and David Clarkson. Jerred Smithson centred Carter Ashton and Nikolai Kulemin on the third line, while Kadri skated on a fourth line that included Troy Bodie in between Frazer McLaren and Colton Orr. The Leafs are alreaady stretched thin at centre thanks to injuries to Tyler Bozak and Dave Bolland.dddddddddddd Bozak resumed on-ice activity this week but is still nursing a lower body injury. He was placed on the injured reserve on Oct. 27 and was expected to miss at least 7-10 days. Bolland will be out indefinitely with a leg laceration he suffered in Saturdays game against the Vancouver Canucks. He was placed on injured reserve on Nov. 4 and is expected to be out for a matter of months. Other centre-ice options for the Leafs include moving Raymond to the middle from his more familiar position on the wing like they did with van Riemsdyk. Another option is Trevor Smith, who is currently with the Toronto Marlies of the American Hockey League. Smith has one goal in nine games with the Leafs this season. If the Leafs look beyond Smith to the Marlies, their current crop of centres includes Sam Carrick, Andrew Crescenzi and Greg McKegg. ' ' '