Tyson Gay may have seen Usain Bolt dominate the 100m and 200m events over the last couple of years, but he insists 'no-one is unbeatable'.

Gay will be attempting to break Tommie Smith's long-standing world record in the 'straight' 200m race at the Great City Games in Manchester.

SUMMER OF ATHLETICS BEGINS
14 May:Diamond League first meeting, Doha 1700-1900 BST live on BBC Red Button and BBC Sport website (UK users only)
15 May:Michael Johnson meets Usain Bolt: The Fastest Man Who Has Ever Lived 1710 BST on BBC Two and iplayer for seven days after (UK users only)
16 May:Great Manchester Run and Great City Games 1000-1130 BST and 1630-1800 BST live on BBC Two and BBC Sport website (UK users only)
19 May: Usain Bolt's season debut at Daegu Pre-Championships, South Korea 1055-1345 BST live on BBC Red Button (UK users only)