Swimming at the 2003 World Aquatics Championships – Men's 50 metre backstroke Swimming at the 2003 World Aquatics Championships – Men's 50 metre breaststroke Swimming at the 2007 World Aquatics Championships – Men's 50 metre breaststroke Swimming at the 2003 World Aquatics Championships – Men's 50 metre butterfly Swimming at the 2003 World Aquatics Championships – Men's 50 metre freestyle Swimming at the 2007 World Aquatics Championships – Men's 50 metre freestyle