SINGAPORE - Caroline Wozniacki credited her training for next months New York Marathon as a key factor in her victory over Maria Sharapova in a grueling three-set match in the WTA Finals on Tuesday.Wozniacki won 7-6 (4), 6-7 (5), 6-2 to beat Sharapova for the second-straight time, having also won in the fourth round of the U.S. Open. Tuesdays result in the round-robin match dealt a major blow to Sharapovas hopes of claiming the year-end No. 1 ranking.Wozniacki, who has always been regarded as one of the fittest players on tour, said her additional running work in preparation for the marathon had taken her stamina to a new level and also given her added belief in Tuesdays 3 hour, 15-minute match.I just feel like right now with all the training and running Ive been doing I can keep being out there and keep running, Wozniacki said. I kept thinking to myself out there in the third set, If youre going to get tired now, how are you going to get through this marathon? You better keep going.As much as she believed the training had helped her aerobic fitness, she said the marathon will be a one-time-only affair and not one that she would recommend to other players.To do it year in and year out, I dont think its possible, Wozniacki said. Our bodies get a beating already. I dont think its necessary to do this again while Im on tour.No such stamina was required in Tuesdays other match as Agnieszka Radwanska had a comfortable 6-2, 6-3 win over Wimbledon champion Petra Kvitova.It was an impressive performance by the Pole, who had been beaten in straight sets the past two times she had played Kvitova. It was the fourth successive year in which the pair had faced each other in their opening matches at the WTA Finals.Sharapova had 15 double-faults, including two while serving for the first set, and 76 unforced errors. Wozniacki finished the match, which had 12 breaks of serve, with 35 unforced errors.The defeat in her opening round-robin match means Sharapova now needs to at least reach the final in Singapore and hope Serena Williams loses her two remaining group matches if she is to overtake the American and finish the season with the top ranking for the first time.Having staved off a set point against her in the 10th game, Wozniacki took the first set by winning the final five points of the tiebreaker.Wozniacki went up a break early in the second, but relinquished the advantage in the sixth game as she complained to the chair umpire about swirling lights which suddenly came on during the middle of a point and remained on for the rest of the game.The Dane recovered quickly after dropping the set, breaking Sharapova early in the third and then twice more to end it.Sharapova was frustrated by her error-strewn performance, blaming her mistakes rather than Wozniackis play for her two consecutive losses to the Dane.Its happened the last couple of times I played against her, Sharapova said. The chances that you have when youre serving for a set, its in your hands to finish that off.When you give those chances back, a player thats top 10 in the world and has the experience as Caroline does, youre not just going to run away with the match.The losses by Sharapova and Kvitova have thrown the White Group wide open, with Radwanskas convincing victory highlighting her title credentials.The Pole has not performed at her best in past appearances at the season-ending event, having been eliminated at the group stage in three out of four years.I feel much better than last year at the championships, Radwanska said. I havent played many matches in the past two weeks, which has helped.Ive learnt my lessons from past years about how to play at my best.The match started after 11 p.m. local time, when Kvitova said normally I am sleeping, and began as an even contest. But Radwanska managed breaks in the Czechs last two service games of the opening set, and then won the final three games of the second set to record a convincing victory.Kvitova, who won only two points on her second serve during the second set, said Radwanska did not produce anything really special but she struggled to read the pace of the court.Sometimes was so fast and so slow, so was really difficult for me to find the timing, Kvitova said. My serve was OK, but she returned a lot of balls back, which is always difficult for me, to then play rally with her.In Wednesdays matches, Williams will face Simona Halep while the other Red Group match will be Ana Ivanovic against Eugenie Bouchard of Westmount, Que. Wholesale Cheap Jerseys . Anything less than gold for either nation is considered a disappointment. Yet for Switzerland, advancing to the semifinal might be a victory in itself. China NFL Jerseys .com) - Kam Chancellor bobbed his head in celebration as he crossed the goal line on his game-clinching 90-yard interception return. http://www.wholesalejerseysnflchinacheap.com/ .C. -- The shot that would have beaten No. Jerseys NFL Wholesale . The No. 23 seed at the first Grand Slam event of the tennis season has worked out all the details, from his training regime right down to where hes going to eat dinner. Authentic China Jerseys Cheap . Team spokesman Donald Beauchamp said there was no new information on the 80-year-old Hall of Famers condition. The family has requested privacy.Ronald Koeman praised the impact of substitute Sadio Mane after he inspired Southampton to a thrilling 3-2 victory over Liverpool on Sunday. The Senegal international started on the bench at St Marys after having his red card against Stoke overturned.When he was introduced at the break with Saints 2-0 behind he missed the chance to cut the deficit as he saw a penalty saved. However, he recovered from the setback to score Saints first goal in the 64th minute and then the winner late in the game shortly after Graziano Pelle equalised.It has been a difficult time for him, Koeman told Sky Sports. He didnt start today or last week but his reaction was fantastic.He kept the belief after missing the penalty and he was important in the second half. Him and Victor (Wanyama) had a big impact. Sadio Mane celebrates Southamptons winner The win keeps Southamptons quest for a European finish on track withh seven games of the season left to play.ddddddddddddYou need to keep going, said Koeman. We have taken six points from two games against Stoke and Liverpool - two must win-games.These six points give everybody a big boost but there is still a long way to go. The game after the international break is against Leicester which will be amazing against the leaders and we will try to stop them.Reflecting on his sides display, Koeman admitted he was concerned at 2-0 down.I was a bit worried because you need to take risks and that gives Liverpool more space and they have top quality players to punish you for that, he said.We were lucky not to be 3-0 down at half-time. Even though we missed a penalty it was great character and spirit, there were several moments that Liverpool let us off but we had 100 per cent belief we could come back and to win from 2-0 is a big compliment to the players. Also See: Southampton 3-2 Liverpool As it happened Southampton fixtures Get a ￡10 free bet! ' ' '