7 June 2012 Last updated at 11:52 GMT

Usain Bolt & Asafa Powell sparkle in Diamond League 100m

Usain Bolt

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BBC Sport looks back at this season's Diamond League 100m showdowns, where Jamaicans Usain Bolt and Asafa Powell plus Americans Justin Gatlin and Tyson Gay have battled for supremacy.

The seventh Diamond League meeting of the season takes place in London on Friday and once again all eyes will be on the sprinters, with Tyson Gay set to take on Britain's Dwain Chambers, while Powell is sidelined due to a groin injury.

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

Available to UK users only.