Bill Scanlon knocked off undefeated Eddie Dibbs, Vijay Amritraj came from behind to down Harold Solomon and Brian Teacher survived a first set tie-breaker against Manuel Orantes tonight in the $200,000 World Championship Tennis Invitational at the Wicomico Youth and Civic Center.

Scanlon recorded his third straight upset, a 7-5, 7-6 nailbiter against Dibbs. It was Scanlon's first victory over Dibbs in four meetings.

Dibbs, who was previously undefeated in the round-robin tournament, could have clinched a spot in Sunday's final with a victory. Scanlon, now tied with Dibbs at 3-1, took the place of Eliot Teltscher, who injured himself in an opening-round loss to Brian Teacher Tuesday.

Using his quickness and agility, Scanlon seemed to thoroughly frustrate Dibbs, who has pretty much had his way in the six-player event. Scanlon, 24, broke service three times and kept Dibbs off balance throughout the contest.

In the second match of the night, Amritraj of India eliminated title hopes for Solomon of Silver Spring with a 4-6, 6-4, 6-2 victory. The winner of Saturday's Amritraj vs. Dibbs match will meet Scanlon in the best of five championship match at 2 p.m.

Teacher, of California, won a 7-2 tie-breaker and went on to shut out Orantes in the second set to record a 7-6, 6-0 win in the final match of the evening.