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. But there was one hairy moment halfway through the second set that threatened to derail Draper’s momentum wh…