It usually pays to be a top seed in tennis. Early upsets, while they happen, arent commonplace. But at the Rio Olympics, being a favorite has become a curse.Through four days, the Games have lost a host of star players, making this one of the more bizarre, unpredictable events in recent memory.Heres a recap of the first four days:Day 1Kirsten Flipkens def. No. 5 Venus Williams 4-6, 6-3, 7-6 (5)Few athletes have worn the red, white and blue prouder than Venus, a four-time Olympic gold medalist (1 singles, 3 doubles). However, Venus, the fifth seed, lost a heartbreaking 4-6, 6-3, 7-6 (5) opening-day match in Rio to Flipkens, a Belgian ranked No. 62 in the world. Venus did not speak to reporters afterward, but U.S. coach Mary Joe Fernandez told the media Venus has been feeling ill before leaving for the Olympics. The same day, No. 4 Agnieszka Radwanska suffered a straight-sets loss against Saisai Zheng.Day 2Juan Martin del Potro?def. No. 1 Novak Djokovic 7-6 (4), 7-6 (2)The incredible shot-making and raw emotion will be remembered as much as the magnitude of this loss by Djokovic. Although Del Potro, the 2009 US Open champion, has fought back from multiple wrist injuries, the reality was that many believed he would never return to the player he once was. But the unseeded Argentine crushed serve after serve and forehand after forehand from the start. Djokovic never had a break-point opportunity in the match. Afterward, del Potro broke down in tears after his biggest win since that US Open seven years ago, while Djokovic was equally as distraught after failing in his quest to capture a gold medal that has eluded him throughout his career.Day 2Lucie Safarova/Barbora Strycova?def. No. 1?Venus Williams?and Serena Williams 6-3, 6-4Riding a 15-0 record heading into Rio, never before had the Williams sisters lost an Olympic doubles match together. But with Serena playing her second match of the day, and Venus still suffering from health issues that had plagued her the day before, the top seeds fell in straight sets to a Czech team that wasnt supposed to be playing together in the first place. (Strycova was a late replacement for Karolina Pliskova.) On the mens side, the No. 2-seeded Murray brothers, Andy and Jamie, also lost.Day 3Gilles Muller def. No. 5 Jo-Wilfried Tsonga 6-4, 6-3The third day of Rios tennis event was the only one without a monumental upset. However, Frances top player, Tsonga, fell rather meekly to hard-serving countryman Muller. Tsonga had entered Rio riding a wave of momentum after reaching the Wimbledon quarterfinals.Day 4No. 15 Elina Svitolina def. No. 1 Serena Williams 6-4, 6-3Serena has had these kind of days before, as evidenced by last years US Open semifinals. But what we saw on Day 4 in Rio was a tentative, sloppy player whose greatest weapon -- her serve -- went haywire. Late in the second set, Serena committed five double faults in one game alone. After all the positive energy she had garnered during her run to the Wimbledon title, this one came as a stunner. Serena never found a rhythm in the match against the Ukrainian and complained of the same shoulder pain that kept her out of the Rogers Cup the week before. Wholesale China Shoes . On Tuesday, Ottawa placed forward Cory Conacher and defenceman Joe Corvo on waivers as trade rumours swirl around the Senators. Cheap Saucony Shoes China . - Raiders general manager Reggie McKenzie never doubted he would bring back coach Dennis Allen for a third year despite back-to-back 4-12 records. http://www.cheapshoeschinaonline.com/cheap-nike-shoes-china-73a.html . The 15th-ranked Canadian men lost the opening two games of their European tour: 19-15 to No. 17 Georgia and 21-20 to No. Cheap Puma Shoes China . The defence is doing its part, too. Drew Brees threw a pair of touchdown passes in the first half and the guys on the other side made sure that was enough, sending the Saints to a 17-13 victory over the Atlanta Falcons on Thursday night. Cheap Vans Shoes China .2 billion agreement with Rogers Communications for the leagues broadcast and multimedia rights. A pesar del bajón que ha tenido en cuanto a la producción de goles, Javier Hernández sigue siendo uno de los hombres que más llama la atención en México y el Viejo Continnente.ddddddddddddLea el texto completo. ' ' '