Japan's former world No. 1 Naomi Osaka pulled out of the ASB Classic final in Auckland, New Zealand, after winning the first set against Denmark's Clara Tauson 6-4 on Sunday.Japanese compatriot Kei Nishikori, meanwhile, fell short in his bid for a 13th ATP tour crown and first in six years, losing to France's Alexandre Muller 2-6, 6-1, 6-3 in the final of the Hong Kong Open.The WTA Tour's official website said the 57th-ranked Osaka retired with an abdominal injury, giving No. 50 Tauson her third career title on the tour.The latest injury puts a question mark on the two-time champion's parti…READ FULL ARTICLE