Wozniacki holds on to her No. 1 ranking

DOHA, QATAR— Caroline Wozniacki outlasted former No. 1 Angelique Kerber 7-6 (4), 1-6, 6-3 in the Qatar Open quarter-finals and ensured she retained the top ranking from Simona Halep on Friday. The No. 2ranked Halep reached the semifinals with a dominating win, though she promptly withdrew with a right foot injury. Wozniacki had to at least match her to stay No. 1, and the new Australian Open champion was pushed for almost 21⁄ hours before 2 prevailing.