Japan's Kei Nishikori claimed the eighth and final entry to the season-ending ATP Finals Saturday when Argentina's Juan Martin del Potro withdrew due to a right knee injury.Nishikori, ranked ninth in the ATP Race to London, will play in the tournament for the fourth time and will join Novak Djokovic, Rafael Nadal, Roger Federer, Alexander Zverev, Kevin Anderson, Marin Cilic and Dominic Thiem at the Nov. 11-18 event in London.The 28-year-old Nishikori reached the semifinals at the ATP Finals in his most recent appearance in 2016."First of all, I want to wish Del Potro a speedy recovery. He h…READ FULL ARTICLE
