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2009 US Open champion Juan Martin del Potro has said he is likely to retire from professional tennis due to a knee injury. Del Potro said the Argentina Open, which starts on February 7, could be his last but he does have a wild card for the Rio Open later this month. The 33-year-old veteran Argentine defeated the five-time defending champion Roger Federer in the final 3-6,7-6, 4-6, 7-6, 6-2 to win the men’s singles tennis title at the 2009 US Open and is a Wimbledon and French Open semi-finalist. Del Potro, who has bronze and silver Olympic medals, last…