MASON, Ohio -- Roger Federer lost another match and, perhaps, his longtime grip on No. 1, as well.
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The world's top-ranked player had another out-of-character setback on Thursday, a 7-6 (8), 4-6, 7-6 (7) loss to Ivo Karlovic that left the Croat exulting on his back and opened the way for Rafael Nadal to take over the No. 1 spot by winning the Cincinnati Masters.
Nadal stayed on course for the seismic shift by beating Tommy Haas 6-4, 7-6 (0) later Thursday, reaching the quarterfinals with his 31st consecutive win. Three more wins and the top spot in the world rankings belongs to him next week.
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