Four Americans in quarters

Brian Viloria, of Waipahu, Hawaii, advanced in the 48 kg class on Sunday as did John Medina, of Fort Carson, Colorado, at 50.8 kg.

In the only other bout involving a US fighter yesterday, Mahammat Abdullaev of Uzbekistan defeated Ricardo Williams Jr of Cincinnati 11-4 in a 63 kg fight.

Juarez, a two-time National champion from Houston, had the most impressive second-round victory as he upset highly regarded Falk Huste of Germany 12-6.

Huste won the silver medal at the 1997 World Championships in Hungary and he was the 1998 European champion.

A three-time National champion, the 21-year-old Vinson of Washington DC, beat Gennadiy Ozarynsky of Ukraine 7-2. Vinso utilised his superior hand speed to beat Ozarynsky to the punch, doubled up with his jab and got the better of the exchanges. Constantly moving and shifting directions, Vinson made himself a elusive target for his taller opponent.

Bennett, of Chicago, defeated Patrick Mesters of the Netherlands 6-3 in his first fight of the competition.

Simms, of Sacramento, California, out-pointed David Haye of England 8-2 by scoring heavily in the late going.

Defending world champion Felix Savon of Cuba beat Andrei Kombaron of Russia 7-5 to advance to the quarter-finals.

Scoring from a distance with left jabs and lead rights, Savon dominated from a distance. When the shorter Russian managed to close the distance, he mauled Savon with clubbing right hooks and overhand lefts.

Cuba and Russia are considered the joint favorites for the team championship.