Tennis: Kei Nishikori withdraws from San Diego Open with back injury

Japan's Kei Nishikori pulled out of the San Diego Open on Tuesday shortly before his first-round clash with fellow wildcard entrant Andy Murray of Britain due to a lower back injury.The match at the ATP 250 event against the former world No. 1 would have been Nishikori's first since he lost in four sets to current world No. 1 Novak Djokovic of Serbia in the third round of the U.S. Open on Sept. 4.On Sunday, Nishikori posted a video of himself practicing with Bulgarian player Grigor Dimitrov on Twitter.Nice practice with @GrigorDimitrov in San Diego. https://t.co/uLBRtWCbow. @atptour…READ FULL ARTICLE