BUDAPEST, Hungary (AP) _ Clarence Vinson, a 19-year-old flyweight from Washington, D.C., edged Japan's Shinya Hotta 8-7 on Monday night, while five other Americans dropped preliminary bouts in the World Amateur Championships.

``I was down by three points in the third, then I managed to score points with straight right punches from behind my double jab,'' said Vinson, who advanced to the final 16.

American light flyweight Gabriel Elizondo fell along with lightweight Jacob Hudson, light middleweight Darnell Wilson, heavyweight DaVarryl Williamson, and super heavyweight T.J. Wilson.

Slovakia's Rudolf Dydi beat Elizondo 15-9, Ukraine's Vladimir Kolesnik defeated Hudson 11-6, Poland's Robert Gortat beat Wilson 5-2, Canada's Mark Simmons edged Williamson 6-4, and Cuba's Alexia Rubaloaba stopped Wilson in the third round.

Five other Cubans won their preliminary bouts, led by light middleweight Felix Savon Sabre, a two-time Olympic champion and five-time world champion who routed Russia's Igor Kshinin 25-4.

Bulgarian light flyweight Daniel Petrov, the 1996 Olympic champion and defending world champion, outpointed Hungary's Pal Lakatos 8-1.