The world tennis number three Roger Federer has cast aside bad memories to beat Argentina's Juan Martin Del Potro 6-3 7-5 at the Cincinnati Open.
Del Potro upset Federer in the 2009 U.S. Open final before injuries set back his career.
It was a much closer encounter in the second set which went with serve until Federer broke to go 6-5 up, although Federer missed out on six break points prior to winning that game.
He'll play American James Blake in the next round.
