RIO DE JANEIRO, Aug 20 (Reuters) - Shakur Stevenson's bid for Olympic gold ended in tears on Saturday but the U.S. bantamweight could see a silver lining as he contemplated his future as a professional.

RIO DE JANEIRO (Reuters) - Arlen Lopez beat Uzbekistan's Bektemir Melikuziev to win the men's middleweight title on Saturday and Cuba's third gold medal of the Olympic boxing tournament.

RIO DE JANEIRO, Aug 20 (Reuters) - Cuba's Robeisy Ramirez beat U.S. hope Shakur Stevenson on a 2-1 split decision to add the Olympic bantamweight boxing title to his 2012 flyweight gold medal on Saturday.

RIO DE JANEIRO, Aug 20 (Reuters) - The first woman to win an Olympic boxing gold medal became the first to repeat the feat on Saturday when Britain's Nicola Adams retained her flyweight title by beating France's Sarah Ourahmoune.

Aug 20 (Reuters) - Olympic schedule at 0530 GMT on Saturday (times GMT):

RIO DE JANEIRO (Reuters) - Claressa Shields had awarded herself a "C" after her first fight in Rio on Wednesday but it was "A" for achievement on Friday after the U.S. boxer punched through to a second successive Olympic middleweight final.

NEW YORK (Reuters) - Muhammad Ali's 1974 WBC heavyweight championship boxing belt and a handwritten letter about his conversion to Islam are among items that will hit the auction block in September, in the biggest such sale since Ali's death in June.

RIO DE JANEIRO, Aug 19 (Reuters) - France's Estelle Mossely celebrated her 24th birthday in style on Friday after coming from behind to win the women's Olympic lightweight gold medal.

RIO DE JANEIRO, Aug 18 (Reuters) - Latest news from the 13th day of competition at the Rio Olympics on Thursday (all times GMT):