British number one Jack Draper says he had a "difficult" time after having his integrity questioned following last week's Cincinnati Open.
The 22-year-old beat Canada's Felix Auger-Aliassime in controversial circumstances when the umpire failed to spot the ball hitting the floor as Draper struck it.
Replays appeared to back up Auger-Aliassime's argument that the ball had hit the frame of Draper's racket and then the floor on match point - but there was no replay technology available at the event.
Draper insisted he had not seen it happen and "would have 100% replayed the point" had it been called.