British tennis legend Tim Henman has concerns over how well Jack Draper's leg can recover in time for Friday.
It comes as the 22-year-old's incredible US Open run continued to motor along with another thrashing at Flushing Meadows.
This time, Alex de Minaur fell victim to the British No. 1, who claimed a 6-3 7-5 6-2 win over the Australian in the US Open quarter-final.
It sets up a delicious tie against either world No. 1 Jannik Sinner or 2021 US Open champion Daniil Medvedev on Friday.
Tim Henman has voiced his concerns over Jack Draper
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But there was one hairy moment halfway through the second set that threatened to derail Draper's momentum when he required medical attention on his right leg.
Moments before, it looked like the Briton was in trouble after feeling out a potential hamstring problem, which required his leg being taped up.
And Henman has admitted he will have his eye on the situation to see if Draper can recover properly in time to face one of two of the best players in the world right now in Sinner or Medvedev.
The former British No. 1 told Sky Sports: "I think he can be so proud of so many different aspects.
"He played great tennis. He obviously had his challenges physically. It’ll be interesting to hear how that leg is feeling."
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De Minaur had problems of his own and it appeared his hip problems from Wimbledon earlier this year had reared its head again.
But the world No. 10 showed why he is ranked so highly with a battling display while the scoreline does not do his performance justice.
Henman added: "De Minaur’s never going to go away.
"He’s a great competitor and he hung in and suddenly [Draper] has to serve to stay in the second set at 4-5, he played a couple of great games to hold serve, to break serve and then to finish it off.
"Then at two sets to love he was in such a strong position."
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Jack Draper reached his first Grand Slam semi-final
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"De Minaur he’s such a good competitor he gets the absolute maximum out of his game. His movement I think is top three in the game.
"But with the hip injury he’s had since Wimbledon it looked like he was struggling.
"For him he’s desperate to make that next step. The next step for him is the semi-finals of a Grand Slam and he’s come up short.
"But I truly believe he will be back in quarter-finals again and make semis in the future."
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Jack Draper needed medical attention midway through the match
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Meanwhile, Draper has admitted he is in fantasy land right now after reaching his first ever Grand Slam semi-final.
He said on court: "To be out here, my first match on the biggest court in the world, it's a dream come true for me. Thank you for the support, it means the world."