By JOE KAY Four games, 16 minutes, only nine points lost. Rafael Nadal couldn't have gotten off to a much better start.The top-ranked player defeated American Taylor Dent 6-2, 7-5 on Wednesday in his opening match at the Cincinnati Masters. He took control by dominating the first four games, setting up his 35th victory in his last 37 matches.Third-ranked Novak Djokovic, fourth-ranked Andy Murray and No.