Tennis player Juan Martin del Potro has announced his retirement from the sport due to a knee injury.
Del Potro said the Argentina Open, which starts on 7 February, will be his last tournament despite having a wild card for the Rio Open later this month.
The 33-year-old Argentine won the US Open in 2009 and is a Wimbledon and French Open semi-finalist.
"I think this is one of the most difficult messages I will ever deliver," he said.
"I know that people are expecting me to return to tennis, but this may be more of a farewell than a return.