Today he beat Italy's top player, Paolo Cane, 6-4, 6-1, 6-2.
Pete Sampras, seeded second, had little trouble disposing of Italy's Paolo Cane, winning by 6-4, 6-4 in 1 hour 20 minutes.
In the final singles match, cut to two of three sets, Slobodan Zivojinovic defeated Paolo Cane of Italy, 6-4, 6-4.
The deciding singles battle between Sweden's Mats Wilander and Italy's Paolo Cane was tied at two sets apiece yesterday when it was suspended because of darkness.
McEnroe, who was penalized a game after a series of outbursts in his quarterfinal singles victory over the Italian Paolo Cane, was again in a volatile mood, but never seemed to lose concentration.
Lendl beat Jonas Svensson of Sweden, 6-2, 6-2, and Becker advanced when his opponent, Paolo Cane of Italy, defaulted because of a strained hamstring.
The other semifinal will match Guillermo Perez-Roldan of Argentina against the winner of the match today between Horst Skoff and Paolo Cane.
Top-seeded Boris Becker struggled early but recovered and rolled past Paolo Cane of Italy, 7-5, 6-1, to reach the third round of the $1 million tournament.
Becker, the top-seeded player, will be matched today against Slobodan Zivojinovic of Yugoslavia, who beat Paolo Cane of Italy, 6-1, 6-1.
In a match that may become a mini-series on the BBC before it is completed, Lendl is trailing Paolo Cane of Italy, 6-3, 5-5.