He returned from hip surgery to win gold in the 4x100m freestyle and medley relays at the Commonwealth Games in Delhi .
Sullivan , 26 , also set the world mark three times at the 2008 Olympic trials in Sydney .
Sullivan returned from hip surgery to win gold in the 4x100m freestyle and medley relays at the Commonwealth Games in Delhi .
Sullivan , 26 , also set the world mark three times at the 2008 Olympic trials in Sydney .