The 33-year-old Haas put up a good fight in the second-round match but couldn’t stop Anderson from clinching a three-set victory.

Milos Raonic of Canada also advanced to the quarterfinals, beating Philipp Petzschner of Germany 6-3, 6-3.

In other action Wednesday, Bernard Tomic of Australia and Grigor Dimitrov of Bulgaria advanced to the second round.

Tomic needed three sets to beat Estonia’s Jurgen Zopp 7-6 (5), 4-6, 6-0, while Dimitrov defeated American Ryan Sweeting 6-3, 6-1.

Second-seeded Argentine Juan Martin del Potro was facing James Blake of the United States later Wednesday.
 
Troicki, Zvonareva advance at Kremlin Cup

In Moscow, defending champion Viktor Troicki and top-seeded Vera Zvonareva advanced to the quarterfinals of the Kremlin Cup with straight-set victories on Wednesday.

The second-seeded Troicki defeated Pere Riba of Spain 6-4, 6-4, while Zvonareva routed Bojana Jovanovski of Serbia, 6-1, 6-1.

Also Wednesday, Kaia Kanepi of Estonia came from 5-1 down in a third-set tiebreaker to upset fourth-seeded Francesca Schiavone of Italy 6-4, 5-7, 7-6 (7) and three-time winner Nikolay Davydenko defeated Teimuraz Gabashvili 7-5, 6-2.

Troicki will face Alex Bogomolov Jr. of the United States, who beat his doubles partner Mikhail Kukushkin of Kazakhstan 6-4, 3-6, 6-4 to advance.

The fifth-seeded Bogomolov Jr. broke his opponent once in the first set to take the lead, but stumbled in the second set, losing four games in a row at one point. He saved two break points before breaking Kukushkin in the third game of the decisive third set, and held on to win.

Bogomolov Jr., who was born in Moscow, is making his debut at the event.

Zvonareva, runner-up here in 2008, won nine consecutive games before Jovanovski held her serve in the fourth game of the second set. The Russian went on to finish the match in just over an hour.

“From the stands the matched looked like an easy one,” Zvonareva said. “But there were tough games in which I managed to stay concentrated. I didn’t make consecutive unforced errors and didn’t allow her to feel as if she was leading the play. And it was the key to my victory.”

The Russian, who has not played a competitive match since losing in the second round in Beijing two weeks ago, is using the tournament to prepare for next week’s season-ending WTA Tour championships in Istanbul.

Dominika Cibulkova of Slovakia defeated Polona Hercog of Slovenia 6-3, 7-6 (3), while Elena Vesnina routed wild card Alla Kudryavtseva 6-0, 6-1.

Schiavone saved two match points before her forehand landed just wide on the third one.

“It was really a tough match,” she said. “I could not play my best. This is the end of the year, so maybe it’s time for me to come back to recover and to recharge my battery to be ready for the next year.”