Corrado Barazzutti, ranked 134th in the world, beat defending champion Guillermo Vilas, 2-6, 6-3, 6-4, in a three-hour match to advance to the semifinals of the $300,000 Monte Carlo Open.

Barazzutti played determined, steady tennis in ousting Vilas, the tournament's No. 2 seed. Vilas, who fought off three match points to win the ninth game of the last set, is ranked fourth in the world.

In other quarterfinal matches, Manuel Orantes upset sixth-seeded Yannick Noah, 2-6, 7-6, 6-3, and Mats Wilander, the tournament's fifth and last surviving seed, defeated Henri Leconte, 7-5, 6-0. Leconte had won Thursday, 4-6, 7-5, 7-6, in Bjorn Borg's finale on the circuit.

On Friday, Mel Purcell reached the semifinals by beating Shlomo Glickstein, 6-0, 7-6. Glickstein had eliminated No. 1 seed Ivan Lendl Tuesday.

Orantes took advantage of Noah's apparent lapses of concentration and easily won the second-set tie breaker, 7-1. He went ahead, 4-1, in the third set and served out the match . . .

In Tokyo, Billie Jean King and Sharon Walsh beat Leslie Allen and Mima Jausovec, 6-7 (7-9), 7-5, 6-4, to advance to the final of the $150,000 Bridgestone Women's Doubles tournament.

King and Walsh used court experience and fighting spirit to come from behind to overcome their two younger opponents at the Tokyo Municipal Gymnasium.