ATHLETICS WORLD CHAMPIONSHIPS
Venue: Olympic Stadium, Berlin Date: 15-23 August
Coverage: Watch the action live and highlights on BBC Two, BBC HD, Red Button, Radio 5 live and the BBC Sport website (video for UK users only)Full BBC coverage details](Sport on the BBC: The best of this week's action - BBC Sport)
**Defending champion Tyson Gay has pulled out of the men’s 200m at the World Championships because of a nagging groin injury.**The American had been expected to provide stiff opposition to Jamaica’s Usain Bolt, who he finished second behind in Sunday’s final of the 100m.
“Rather than risk further injury, I will not compete in the 200m. I want to help our 4x100m relay team,” said Gay.
Bolt, who set a new 100m world record, runs in Tuesday morning’s 200m heats.
Later in the day, Britain’s world and Olympic champion Christine Ohuruogu faces America’s Sanya Richards in the women’s 400m final.
606: DEBATE
“How do you see day four of the World Championships panning out”
BBC Sport’s Peter Scrivener
Fellow Brits Phillips Idowu and Nathan Douglas go in the final of the triple jump while David Greene will be looking to upset American duo Kerron Clement and Bershawn Jackson in the 400m hurdles final.
Medals are also up for grabs in the men’s 3,000m steeplechase, with Kenya’s Ezekiel Kemboi the only man in the field to have cracked eight minutes this season, and the women’s javelin.