John Isner and Tommy Haas, the tournament's top two seeds, moved into the quarterfinals Thursday at the rain-delayed Delray Beach Championships.
Second-seeded Tommy Haas of Germany led the group that advanced to the second round of the Delray Beach International Tennis Championships Tuesday.
No. 1 seed John Isner coasted into the semifinals of the Delray Beach Championships Friday while Andy Roddick fell to Kevin Anderson.
No. 1 seed John Isner, having climbed to a career-best 11th in the world rankings, breezed into the quarterfinals Wednesday at the Delray Beach Championships.
Andreas Haider-Maurer, a last-minute entrant into the field, had an upset quarterfinals victory Friday in the Bank Austria Tennis Trophy tournament in Vienna.
Ukrainian Sergiy Stakhovsky upset fourth-seeded Mikhail Youzhny Monday in the first round of the Qatar Open.
No. 2 seed Nikolay Davydenko and last year's runner-up Fernando Verdasco were among the winners Tuesday in the opening round of the St. Petersburg Open.
Juan Martin del Potro, coming off a runner-up finish in Tokyo, advanced past the first round Wednesday at the Bank Austria Tennis Trophy.
James Blake won his first-round Olympic tennis match Sunday and top-seeded Serbian Ana Ivanovic withdrew from the Games with a thumb injury.
Fernando Gonzalez and Marcos Baghdatis, the tournament's first and third-seeded players, were both ousted Thursday at the Tennis Channel Open in Las Vegas.