Isner edges out Pospisil
John Isner overcame a second-set blip to beat Canada's Vasek Pospisil 7-6 (7/3) 2-6 6-3 in the second round of the SAP Open in San Jose.
The second-seeded American, who had a bye in the first round, edged the first set on a tie-break but fell apart in the second, losing all five second-serve points and being broken twice as his opponent raced through it to level the match.
But Isner refound his form and won in one hour and 48 minutes to book his place in the quarter-finals, where he will face either eighth seed Xavier Malisse or Matthew Ebden, who beat South African qualifier Rik de Voest in straight sets in his first-round game.
Wednesday's other second-round game was won by German veteran Tommy Haas, the fourth seed comfortably beating Canadian Jesse Levine 6-3 6-1.
Michael Russell came out on top in his all-American clash with Donald Young, beating the qualifier 6-3 7-5 in the first round.
And there was a win for another American, wildcard and world number 154 Steve Johnson, who edged out Ivo Karlovic 6-7 (2/7) 6-4 7-6 (8/6).
Finally, Colombia's Alejandro Falla beat Flavio Cipolla 7-6 (7/1) 7-6 (12/10) in a gruelling contest which lasted two hours and 35 minutes.