The Commonwealth Games 100 metres champion Kim Collins has failed to recover in time from a groin injury and will be unable to defend his title in Melbourne.
Collins is only recently back to full-time training and his presence in Melbourne for the Games which started on Thursday was always in doubt.
The 29-year-old St Kitts and Nevis sprinter picked up the injury at last summer's world championships in Helsinki.
Collins failed to defend his global title in Helsinki, but his bronze medal behind Justin Gatlin and Michael Frater again emphasised his world class ability and proved him to be the man for the big occasion.
He only returned to serious training in January and has set his sights on preparing for the summer season - and the lucrative IAAF Golden League and Grand Prix circuits.