Rafael Nadal might be forced to withdraw from the ATP World Tour Finals next week due to a shoulder injury.
Novak Djokovic, who is suffering from the same ailment, also might miss the event.
Nadal revealed that he hurt his shoulder in a training session, and is still hopeful that he will play in the prestigious year-end event.
However, some rumours are going around that he might skip it in order to be fully fit for the Davis Cup final against Argentina.
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