Henman: "It's hard to have a hip problem".

Jannik Sinner's physical condition, and in particular the state of his hip, has been the focus of concern for several weeks. Despite winning the Masters 1000 title in Cincinnati, the Transalpine continues to worry about his persistent discomfort.

When asked about the current world number 1's chances at the US Open, Tim Henman, former world number 4, made no secret of the fact: tennis-wise, Sinner is of course the favorite. However, the current physical state of the Australian Open winner leaves some doubt.

Henman said: "Fitness is the biggest question mark surrounding Sinner ahead of the US Open, and it's hard to have a hip problem if you're trying to win seven best-of-five-set matches at the US Open."