Two-time defending champ Milos Raonic advanced to the quarterfinals with a win over Michael Russell Thursday at the SAP Open.
Janko Tipsarevic, the No. 5 seed at the PBZ Zagreb Indoors tennis event, went down in a first-round upset Tuesday in Croatia.
American James Blake began play in the Paribas Masters in Paris Sunday with a first-round victory over soon-to-retire French veteran Fabrice Santoro.
Fifth-seeded Frenchman Fabrice Santoro and sixth-seeded German Benjamin Becker were first-round losers Tuesday at the Open de Moselle.
Defending champion Dmitry Tursunov of Russia and second-seeded Frenchman Gilles Simon were winners Monday at the Indianapolis Tennis Championships.
Former champion Ivan Ljubicic was among Tuesday's first-round winners at the Lyon Tennis Grand Prix.
Sixth-seeded German Benjamin Becker was a first-round upset loser Monday at the U.S. Men's Clay Court Championships in Houston.
Top-seeded Andy Roddick led Wednesday's winners at the ATP SAP Open Tennis Tournament at San Jose, Calif.
Third-seeded James Blake and No. 4 Marcos Baghdatis took different paths to second-round matches in the Medibank International tennis event in Sydney.
Fourth-seeded Marcos Baghdatis was a straight-set winner Monday in the first round of the Medibank International tennis tournament in Sydney.