Sam Querrey up in third set, has momentum

Sam Querrey is competing now and playing with confidence.

With the crowd behind him, Querrey is now up 2-1 in the third set against Stanislas Wawrinka in a fourth-round match at Arthur Ashe Stadium.

Querrey rallied and took the second set 7-6 (7-5) after dropping the first set, also 7-6.

UPDATE (3:37): Querrey is now up 3-1 in the third set.

UPDATE (3:44): Wawrinka has fought back, now has the lead in the third set 4-3.

UPDATE (3:49): Querrey has tied it. It's 4-4.

UPDATE (3:54): Wawrinka up 5-4. Great match.