NEWPORT, R.I. -- Second-seeded Grigor Dimitrov and fifth-seeded Alex Bogomolov advanced in the opening round of the Hall of Fame Tennis Championships on Monday.
Dimitrov ousted Brian Dabul, a semifinalist in Newport last year, 6-2, 6-4, and Bogomolov rallied against Mischa Zverev, 4-6, 6-3, 6-1. Sixth-seeded Olivier Rochus, a finalist on Newport's grass courts last year, also advanced, beating Greg Jones 6-4, 3-6, 6-3.
Top-seeded John Isner is expected to play Tuesday.
The 20-year old Dimitrov, ranked No. 60 entering the week, is the second youngest player in the top 100 on the ATP tour.
"The beginning was real soft, then I thought I've got to improvise," he said. "I decided to mix up the game."
Bogomolov enters the week ranked 66th and Rochus is 74th.
Rochus also was a semifinalist in Newport in 2009 and made the quarterfinals in '08. He's glad to be back.
"It could have gone either way," Rochus said. "It's very nice. I really like this tournament. I came to Newport just for this."
Isner replaced defending champion and top-seeded Mardy Fish, who withdrew when he was added to the United States Davis Cup team.
The tournament is played in conjunction with Hall of Fame induction ceremonies that highlight the week. Andre Agassi will headline the 2011 class Saturday during a center-court ceremony.