BENGALURU (Reuters) -World number nine Jack Draper said the ATP Tour must review its packed calendar if young players are to have long careers, after Holger Rune sustained a serious injury and joined a growing list of players breaking down as the season nears its end.

The relentless men's and women's tennis circuits, which run for 11 months, have come under a harsh spotlight in recent weeks with a string of high-profile players, including Draper, pulling out of tournaments and prematurely ending their seasons.