13 July 2012 Last updated at 10:51

London 2012: Tyson Gay on how he can beat his Jamaican rivals

American sprinter Tyson Gay admits it will be "very difficult" to beat the Jamaicans for the 100m Olympic title at the London Games, and believes he will have to race at least 9.70 seconds to win a medal.

Gay promises to be on his "A game" when he faces Jamaican trio Yohan Blake, Asafa Powell and Olympic champion Usain Bolt.

The American, who will compete at this Friday's Diamond League meeting in London, also discusses recovering from injury and his excitement at competing at the Olympics in two weeks' time.

DIAMOND LEAGUE: AVIVA LONDON GRAND PRIX

  • Venue: Crystal Palace
  • Date: Friday, 13 and Saturday, 14 July
  • Starts: 17:35 BST on Friday and 13:00 on Saturday

Coverage: Live on BBC Two and BBC Sport website from 18:00 on Friday and from 14:00 BST on BBC One on Saturday. Also live on BBC Radio 5 Live