British boxer Amir Khan has kept his hopes of punching his way to another world title fight alive on a night which saw Olympian Anthony Ogogo began his pro career with a win.
Headline-act Khan was knocked to the canvas in the fourth round in Sheffield but stayed strong against Mexico's Julio Diaz to claim a hard-fought points victory at the Motorpoint Arena.
Earlier Ogogo, a bronze medallist at London 2012, defeated veteran Kieron Gray with a knockout in the second round on his professional debut.
More: Audley Harrison's career comeback lasts 70 seconds
London Olympics day ten
Great Britain's Anthony Ogogo won his middleweight boxing quarter-final against Germany's Stefan Hartel.
It means the 23-year-old is guaranteed at least a bronze medal as there is no playoff for losing semi-finalists.