The members of the US men's 4x100 metres relay team that won silver at the 2012 Olympics have been stripped of their medals following the doping conviction of sprinter Tyson Gay.
Not even Usain Bolt could overcome a big American lead as the US men sprinted to a convincing victory over Jamaica in the 4x100 metres relay at the IAAF World Relays in Nassau on Saturday.
Asafa Powell ran the fastest 100 meters in the world this year.