Argentina's Juan Esteban Curuchet and Walter Fernando Perez win gold in the men's Madison as Britain's Bradley Wiggins and Mark Cavendish finish joint-eighth.
Rebecca Romero and Wendy Houvenaghel go head to head for the Olympic women's individual pursuit title on Sunday, with Britain guaranteed gold and silver medals.
Chris Hoy and Ross Edgar grab Olympic gold and silver medals for Great Britain with brilliant performances in the final of the men's keirin in Beijing.
Britain's Bradley Wiggins retains his Olympic 4000m individual pursuit title with a magnificent ride, while Steven Burke and Chris Newton claim bronze medals.