Japan's world No. 9 Kei Nishikori saved three match points in the second set and advanced to the semifinals of the Citi Open on Friday after a come-from-behind victory over American wild card Tommy Paul.Second-seeded Nishikori, defeated Paul 3-6, 7-6(8), 6-4 in 2 hours, 39 minutes at the Rock Creek Park Tennis Center in Washington.Nishikori, who won the tournament in 2015, will play against Germany's fifth seed Alexander Zverev in the semifinals. Zverev, who is ranked eighth in the world, beat Russian Daniil Medvedev 6-2, 6-4.Paul appeared to be on course for a shock victory after holding m…READ FULL ARTICLE