Tuesday's results:
(4) L Hewitt defeats M Ebden 6-4, 6-1
J Sock defeats (6) M Matosevic 6-2, 0-0
N Mahut defeats R Williams 6-2, 6-4
T Smyczek defeats (1) S Querrey 6-4, 7-6(8)
I Karlovic defeats (5) E Roger-Vasselin 7-6(5), 6-4
(8) R Ram defeats A Bossel 6-2, 6-2
V Pospisil defeats D Kudla 1-6, 6-3, 6-3
A Kuznetsov defeats (7) K De Schepper 6-3, 6-4
J Hernych defeats A Pavic 7-6(6), 6-3
M Russell defeats I Marchenko 6-1, 4-6, 6-4
P Amritraj defeats F Cipolla 6-2, 6-3
(3) I Sijsling defeats M Viola 6-4, 6-1