Roger Federer has withdrawn from the Miami Open after suffering from a stomach virus. The current world No 3 was due to face Juan Martin Del Potro in a second round match but has been forced to pull out of the tournament after reportedly suffering gastroenteritis.Fridays match would have been Federers first since his semi-final loss to world No 1 Novak Djokovic at the Australian Open in January. The 34-year-old Swiss was forced to undergo corrective surgery after injuring his knee the day after his loss to the Serb in Melbourne. I am very sorry that I have to pull out of the Miami Open with a stomach virus, Federer said in a statement on Friday. Federer was due to play Argentinas Juan Martin Del Potro I feel bad for the tournament and the fans as I have rarely ever had to withdraw at such short notice.I have not felt great for a few days, and unfortunately it got worse in the last 24 hours. I was really excited to have my comeback in Miami but I am in no condition to play.I tried to warm up this morning, but it was clear that I could not compete.The 17-time Grand Slam champion will now be replaced by Argentinian lucky loser Horacio Zeballos in the main draw of the tournament.Watch the Miami Open on Sky Sports 3 HD - your home of tennisBy purchasing a Sky Sports Day Pass for £6.99 or Sky Sports Week Pass for £10.99, you can enjoy access to all seven Sky Sports channels and watch on a TV with a NOW TV Box or on a range of devices. Also See: Federer ready for Miami return Federer slams Dubai testing LTA ponder next Bedene move Tennis on Sky Mitchell Trubisky Bears Jersey . Johns, N.L., to Thunder Bay, Ont., after a deal was announced to build a new $106-million "event centre" in the Lake Superior community. Mike Ditka Jersey . Villar connected off Joe Saunders (11-14), sending a drive well over the left-field fence for his first career homer. The Astros scored six times in the first three innings to chase Saunders. http://www.bearsrookiestore.com/Bears-Gale-Sayers-Jersey/. -- The Orlando Magic finally are showing the patience in critical moments that coach Jacque Vaughn has been waiting for all season. Devin Hester Womens Jersey . It was a loss. But it was also a learning experience. Deron Williams and Joe Johnson had 24 points each to lift Brooklyn to a 94-87 win over the Raptors, making their first playoff appearance since 08. "I thought we played a little bit as expected as it is our first playoff game," Toronto coach Dwane Casey said. Mike Singletary Womens Jersey . They say things like "stress is when you dont know what youre doing" and "I wasnt hired to motivate players, I was hired to coach motivated players." They ring as true now as they did when Mularkey heard them the first time playing tight end for the Pittsburgh Steelers Hall of Fame coach 25 years ago.After a bit of a slow start at the 2014 Olympic Winter Games, the United States is right up there in the overall medal standings. Seven days into the competition, the U.S. began the day with four gold, two silver and six bronze medals. They are ranked fifth and have the second largest total amount of medals (12) behind Norway. Team USA has produced medals in alpine skiing, freestyle skiing, figure skating, luge and snowboarding. The glaring omission: long track speed skating. Coming into these Games, the U.S. was third in the all-time long track speed skating standings with 67 total medals and they lead in overall gold with 29. Its been 30 years since the U.S. didnt win at least one speed skating medal at the Olympics. In Sochi, Americans Brittany Bowe and Heather Richardson were the undisputed gold medal favourites in the womens 1,000 meters. Between the two, they won every World Cup race this season but in Russia they finished seventh and eighth. Shani Davis was expected to complete his historic three-peat in the 1000m and yet he finished eighth. No American has finished better than seventh place so far. In a sport where races are decided by hundredths of a second, the talk in Sochi has been about the new Under Armour suits U.S. skaters are wearing. Developed in secrecy in corporation with Lockheed Martin, the Mach 39 as it is known even looks uncomfortable to the untrained eye.dddddddddddd A ventilation panel on the back is possibly to blame for taking in air, which hinders skaters from achieving the deep squatted stands required to deliver the ultimate stride. Then there is the U.S. training facility. American skaters have been preparing for Sochi in a building that hosts the fastest ice on the planet in Salt Lake City. The oval is on altitude which ensures fast conditions. However, the Adler Arena in Sochi is on sea level and its properties are completely different. The ice is considered slow where skaters need to rely less on technique and finesse and more on stamina and sheer determination. Team Canada trains on altitude in Calgary and perhaps it is not a coincidence that Denny Morrisons memorable silver moment is the only Canadian medal in Sochi so far. Time is running out for the U.S. long track team - and for Canadas - with only six medal events left at these Games. Both countries have slim medal hopes in the mens 10,000m and the womens 5,000m. The 1,500m - often considered the crown jewel of long track - is wide open but other than that, medaling at the team pursuit is needed to prevent historic lows. ' ' '