Jamaican sprinter Yohan Blake has refused to pick a winner in the battles for 100m and 200m gold, which look to be between him and teammate Usain Bolt.
Blake, who has beaten Bolt twice in the national trials already this year, did not go so far as to tip himself for gold, but said that on the night anything is possible.
The 22-year-old, who has recently been tipped by former 100m world record holder Maurice Greene for the 100m gold, has insisted that it is every man for himself when the time comes.
"Anything can happen on the day. When we cross that line on Sunday we will see," The Guardian quotes Blake as saying.
"When everybody lines up it's going to be all business. Each man for himself. I'm there thinking yes of course I want to kill these guys."
Blake won 100m gold in the 2011 World Championships after Bolt was disqualified for a false start.
