Andre Agassi moved into the quarterfinals of the Pacific Life Open with a 7-5, 6-2 victory Tuesday over Russia's Mikhail Youzhny on.
Top-ranked Roger Federer of Switzerland, and Argentinians Juan Ignacio Chela and Guillermo Coria also were among the fourth-round winners.
In the women's competition, Lindsay Davenport earned a quarterfinals berth with a straight sets win over fellow American Meghann Shaughnessy.
Federer ran his record for the year to 19-1 with a methodical 6-4, 6-1 victory over America's Mardy Fish. The win was the Swiss star's 24th in 25 matches dating to his Tennis Masters Cup championship last November.
Chela, who ousted two-time defending champion Lleyton Hewitt of Australia a day earlier, came back with a 6-4, 6-2 victory over Germany's Tommy Haas.
Coria lost the first set but came back to beat Frenchman Sebastien Grosjean 3-6, 7-6 (2), 6-2.
Former No. 1 Davenport, back at full strength after fighting injuries the past three years, beat Shaughnessy 6-1, 6-3.
Federer played his usual steady game to beat Fish, making just 11 unforced errors to Fish's 28. Fish also had five double faults.
Chela followed his three-set win over Hewitt -- ending the Australian's 13-match winning streak -- with a similarly consistent performance against Haas.
The 24-year-old Argentine was especially effective with his spinning, hard-to-handle second serves, winning points on 15 of his 18 in the match.
Haas, a former No. 2 coming back from 2002 shoulder surgery that sidelined him all last year, complimented Chela.
Davenport, ranked No. 4, looked entirely back in form. She has lost only seven games in three matches this week at Indian Wells, where she has appeared in four of the last seven finals and won twice.
She underwent surgery last October to sever a nerve between the third and fourth toes on her left foot and relieve pain that had been hampering her.
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