Davydenko exits St. Petersburg draw

Croatian qualifier Marin Cilic stunned the world No. 4 Davydenko in 1-6, 7-5, 6-1 fashion on the indoor carpet at SCC Peterburgsky. Cilic prevailed in 1 hour, 55 minutes, as Davydenko piled up 10 double faults and had his serve broken four times.

Second-seeded Brit Andy Murray and third-seeded Russian Mikhail Youzhny avoided upsets, as Murray handled Czech qualifier Lukas Dlouhy 6-2, 6-4 and Youzhny drilled last year's St. Petersburg titlist Mario Ancic 6-4, 6-2. The Croatian Ancic beat Swede Thomas Johansson in last year's finale here. Youzhny captured this event in 2004 and was the runner-up in 2002.

In other Day-4 action, fourth-seeded Italian Potito Starace stopped Russian qualifier Mikhail Ledovskikh 7-6 (7-4), 6-2 and sixth-seeded Spaniard Fernando Verdasco vaulted past Italian Simone Bolelli 6-4, 6-4.

Friday's quarterfinals will pit Murray against fifth-seeded Russian Dmitry Tursunov, Youzhny versus seventh-seeded German Philipp Kohlschreiber, Starace against Verdasco and Cilic versus Latvian Ernests Gulbis.

The 2007 St. Petersburg champion will take home $142,000.