NEW YORK — French Open champion Stan Wawrinka kept the pressure on to end the threat posed by Donald Young and register a 6-4 1-6 6-3 6-4 victory over the American to reach the quarter-finals at the U.S. Open on Monday.
Fifth seed Wawrinka stayed on track for a possible last eight clash against third seed Andy Murray, who was meeting big-serving South African Kevin Anderson in the fourth round.
The Swiss shut the door on the 68th-ranked Young by not allowing the American to reach a single break point in the fourth set.