We are halfway to the men's singles final four as No. 6 seed Sam Querrey and No. 7 Igor Andreev prevailed in grueling three-set matches.

Querrey appeared ready to blitz top-seeded Nikolay Davydenko, ripping seven aces and dropping just two points on serve in winning the first set in 29 minutes. Davydenko didn't climb to No. 8 in the world rankings for no reason and he made some adjustments on his return of serve strategy to even the match. Davydenko also bounced back from an early break in the third set. Davydenko had a pair of break points which, if he could have converted, would have allowed the 2006 Pilot Pen champion to serve for the match. But Querrey answered back with first serves of 133, 122 and 133 en route to the hold. Three errors by Davydenko aided Querrey's match-clinching break in a 6-3, 3-6, 6-4 win.

Andreev squandered nine of 12 break points but still had a chance to serve for the match. A pair of Andreev double faults kept Leonardo Mayer alive before Andreev eventually won 6-4, 6-7, 6-3.

Vesnina took out fellow Russian and 2008 Pilot Pen finalist Anna Chakvetadze 6-1, 7-5.