INDIANAPOLIS, AUG. 12 -- Rex Chapman scored 18 points to lead five double-figure scorers as the United States remained unbeaten in men's basketball at the Pan Am Games with a 105-73 victory over Mexico tonight.

The U.S. team (3-0) will meet Venezuela, 2-0, Thursday night with the top spot in their pool at stake for seeding in the quarterfinal round.

Chapman, a guard from Kentucky, scored 11 of his points in the second half when the United States maintained at least a 19-point lead over the final 13 minutes.

Joining Chapman in double figures were Pervis Ellison of Louisville with 13 points, Danny Manning of Kansas (14) and Keith Smart of Indiana and David Robinson of Navy (12 each).

The U.S. team led, 72-54, with 11:03 to play and went on an 18-7 run with Chapman, Robinson and Pittsburgh's Jerome Lane scoring four points each.

The U.S. team continued to expand the lead, taking a 100-64 advantage with 1:37 to play on a side jumper by Jerome (Pooh) Richardson of UCLA.

Esteban Ledezma led Mexico (0-3) with 21 points.

The U.S. women played their first game today, beating Peru, 110-41, as Teresa Edwards, Alisa Scott, Cynthia Cooper and Clarissa Davis each scored 14 points.

In another women's game, Cuba routed Mexico, 90-49.

Volleyball: The U.S. men's team beat Brazil 11 out of 13 times this year and were favored to win again in this first-round match against the South Americans. But they wound up collapsing in the fifth set. The fifth set was tied, 8-8, but the Americans would not score another point. Brazil did a much better job of finishing its spikes and scored the final seven points to take a 12-15, 17-15, 15-9, 3-15, 15-8 victory.

The U.S. team, trailing two sets to one, blew out Brazil, 15-3, in the fourth set, but the Americans missed their best player, Karch Kiraly, who could not play the front line because of a broken hand. He did play briefly in the second, fourth and fifth sets, but he was not able to help the United States up front, where some additional power was sorely needed.