Top seed Novak Djokovic moved into the semi-finals of the US Open after his opponent Jo-Wilfried Tsonga retired with injury.
Djokovic was leading 6-3 6-2 at the time.
Djokovic has had an easy ride so far a walkover in the round 2, a retirement in the third round and now a second retirement in the quarter-final.
He meets Gael Monfils in the semis.
In the women’s tournament Germany’s Angelique Kerber moved into the semis after she defeated Italy’s Roberta Vinci with a crushing 7-5 6-0 victory.
After a close and hard fought first set Vinci simply folded in the second.
Denmark’s former world number one, Caroline Wozniacki will be her opponent
in the last four.
The Dane delivered a ruthless performance against Anastasija Sevastova, the first Latvian ever to reach a Grand Slam quarter final, 6-0 6-2