Seventh seed Viktor Troicki pressed on, while former world No. 3 Nikolay Davydenko suffered an opening-round upset at the inaugural $530,000 Power Horse Cup, a final French Open tune-up.
The Serbian Troicki came back to best American journeyman Michael Russell, 3-6, 6-3, 6-4, while Slovenian lucky loser Aljaz Bedene surprised the eighth- seeded Russian veteran Davydenko, 3-6, 6-4, 6-3, on the red clay at Rochusclub, which used to play host to the ATP World Team tournament.
Also on Day 3, Dutchman Igor Sijsling dropped Kazakhstani qualifier Evgeny Korolev, 6-2, 6-4, and Slovenian Grega Zemlja overcame Belgian David Goffin, 5-7, 6-0, 6-2.
The second round will be staged on Wednesday, including matches for top seeds Janko Tipsarevic and Tommy Haas. The Serbian Tipsarevic will take on Argentine qualifier Guido Pella, while the long-time German favorite Haas will encounter Croat Ivan Dodig.
This week's winner will collect $95,000.