Usain Bolt - Jamaica <br> Event - 100 metres, 200 metres, 4 x 100 metre relay </br> Career highlight - Reigning World and Olympic Champion in 100 metres, 200 metres, 4 x 100 metre relay </br> Reason for pullout - To focus on 2012 London Olympics
Asafa Powell - Jamaica <br> Event - 100 metres and 4 x 100 metre relay </br> Career highlight - 2005-2008 100 metres world record holder </br> Reason for pullout - Injury
Shelly-Ann Fraser - Jamaica <br> Event - 100 metres </br> Career highlight - Reigning Olympic and World champion in 100 metres </br> Reason for pullout - To prepare for the World Championships </br>
Stephanie Rice - Australia <br> Event - Swimming </br> Career highlight - Three gold medals in the 2008 Beijing Olympics </br> Reason for pullout - Shoulder injury
Dani Samuels - Australia <br> Event - Discus throw </br> Career highlight - Reigning and youngest world champion </br> Reason for pullout - Security concerns
Christine Ohuruogu - Britain <br> Event - 400 metres </br> Career highlight - Reigning 400 metres Commonwealth and Olympic champion </br> Reason for pullout - Injury
Phillips Idowu - Britain <br> Event - Triple Jump </br> Career highlight - Reigning World and Commonwealth champion </br> Reason for pullout - Security concerns
Chris Hoy - Scotland <br> Event - Cycling </br> Career highlight - Three gold medals at the 2008 Beijing Olympics </br> Reason for pullout - CWG clashes with the European Championships, an event he is required to compete in to qualify for the 2012 London Olympics