Top-seeded Monica Seles of the United States has advanced to the quarterfinals of the Madrid Open in Spain, but two of the remaining seeds lost their second round matches at the claycourt tennis tournament. Seles, who had a bye in the first round, moved into the quarterfinals Wednesday, with a 7-5, 6-2 victory over Spain's Marta Marrero. But American Chanda Rubin provided the biggest upset of the day when she toppled second-seeded defending champion Arantxa Sanchez Vicario of Spain, 6-3, 7-6.
Eighth-seeded Rita Grande of Italy was also bitten by the upset bug, falling to Fabiola Zuluaga of Colombia, 7-5, 7-5. Fifth-seed Anna Smashnova of Israel will play Seles in the quarterfinals after defeating Alicia Molik of Australia, 7-5. 6-2. In matches involving non-seeded players, Argentina's Paola Suarez, Emilie Loit of France, Clarisa Fernandez of Argentina and Magui Serna, the last Spaniard left in the tournament, all advanced.