Olympics-Men's boxing welterweight quarter-finals results (Reuters)

LONDON, Aug 7 (Reuters) - Kazakhstan's Serik Sapiyev beatVenezuela's Gabriel Maestre 20-9 in an Olympic men's boxingwelterweight quarter-finals bout on Tuesday. Results Table Serik Sapiyev (Kazakhstan) beat Gabriel Maestre (Venezuela)20-9 Andrey Zamkovoy (Russia) beat Errol Spence (U.S.) 16-11 Fred Evans (Britain) beat Custio Clayton (Canada) 14-14 Taras Shelestyuk (Ukraine) beat Alexis Vastine (France) 18-18