Nice, France (SportsNetwork.com) - Top seeds John Isner and Ernests Gulbis were among Wednesday's second-round winners at the Nice Open, a final clay court French Open tune-up.
The 6-foot-9 American slugger Isner popped eight aces in getting past qualifier, fellow countryman and good friend Jack Sock 6-4, 6-3 in 77 minutes, while the Latvian Gulbis fought back to best Slovak and recent Munich titlist Martin Klizan 6-7 (4-7), 6-4, 6-1 at Nice Lawn Tennis Club.
Up next for Isner will be Argentine Federico Delbonis, while Gulbis' quarterfinal opponent will be fifth-seeded Russian Dmitry Tursunov.
Meanwhile, Tursunov dismissed Dutchman Robin Haase, 6-3, 6-4; Argentine Carlos Berlocq upset sixth-seeded Frenchman Nicolas Mahut 6-2, 6-3; a seventh-seeded Delbonis handled wild card and oft-injured Frenchman Paul-Henri Mathieu 6-2, 6-4; and Argentine qualifier Leonardo Mayer drove out eighth-seeded Frenchman Edouard Roger-Vasselin 6-4, 3-6, 7-5.
Also on Day 4, reigning Nice champion Albert Montanes, of Spain, overcame American lucky loser Sam Querrey 4-6, 6-3, 6-2. Querrey replaced Gael Monfils in the draw. Montanes was scheduled to meet Monfils Wednesday in a rematch of last year's Nice finale, which was won by the Spaniard.