There were scary scenes on Court 8 on the opening day of the US Open when Yoshihito Nishioka was forced to retire from his match with Miomir Kecmanovic after collapsing to the floor. Kecmanovic forced a deciding set after winning the fourth before things took a turn for the worse for his opponent. Nishioka looked in some discomfort at the start of the fifth set as Kecmanovic held serve to love. The 28-year-old’s service game went to deuce with Nishioka seen bending over in pain while clutching his leg. He carried on for the next point but worried spectators when he collapsed to the ground at t…