British number one Kyle Edmund defeated American wildcard Mackenzie McDonald to advance to the second round of the Cincinnati Masters on Monday.
Edmund, 23, beat McDonald 6-3 6-2.
Edmund will next play the winner of American Frances Tiafoe or Canada’s Denis Shapovalov.
Meanwhile, world number one Rafael Nadal withdrew from the tournament after winning the Rogers Cup in Toronto on Sunday.
The US Open, the final Grand Slam of the year, starts on 27 August.
The withdrawal leaves Roger Federer as the top seed in Cincinnati. The Swiss 20-time Grand Slam winner had missed the Rogers Cup as part of his strategy to prolong his career.
Former world number one Andy Murray opens his Cincinnati campaign against Frenchman Lucas Pouille later on Monday while Stan Wawrinka and Novak Djokovic are also in action.