Tennis Roundup : Chang Defeats Chamberlin to Reach S.F. Quarterfinals

French Open champion Michael Chang beat Wimbledon quarterfinalist Paul Chamberlin of San Diego, 6-1, 6-2, Thursday night to gain the quarterfinals of the $425,000 Volvo of San Francisco tennis tournament.

Chang, of Placentia and the defending champion here, took just one hour to eliminate Chamberlin.

In other matches, Jim Grabb of Tucson upset fourth-seeded Tim Mayotte of Bradenton, Fla., 4-6, 6-3, 7-5; Derrick Rostagno of Brentwood defeated Canadian Andrew Sznajder, 6-3, 6-2, and South African Cristo Van Rensburg downed countryman Pieter Aldrich, 7-5, 6-4.

Ivan Lendl of Czechoslovakia moved into the quarterfinals of a $255,000 tournament by beating Lawson Duncan, 6-1, 7-6 (9-7), at Bordeaux, France.

Lendl, the top-ranked player in the world, will meet Henri Leconte of France in the quarterfinals. Leconte downed Jimmy Brown, 6-3, 3-6, 6-3.

In other matches, fourth-seeded Jaimie Ycaza of Peru won by default over Juan Aguilera of Spain, and Cassio Motta of Brazil outlasted Marian Vajda of Czechoslovakia, 1-6, 6-0, 7-6 (8-6).

Top-seeded Alberto Mancini of Argentina defeated Austrian qualifier Stefan Lochbihler, 6-4, 6-0, to reach the quarterfinals of a $123,400 tournament at Palermo, Italy.

Eighth-seeded Goran Ivanisevic of Yugoslavia turned back Italy’s Simone Colombo, 6-4, 7-6, and will meet Mancini in the quarterfinals.