Japan's Nishikori qualifies for ATP Tour finals in London

Tennis - Japan Open Men's Singles First Round match - Ariake Coliseum, Tokyo, Japan - 05/10/16. Kei Nishikori of Japan returns a ball during his match against Joao Sousa of Portugal. REUTERS/Kim Kyung-Hoon

(Reuters) - Japan's Kei Nishikori will make a third straight appearance at the ATP Tour finals next month after becoming the fifth player to qualify for the season-ending tournament, organisers said on Wednesday.

The 26-year-old world number four will join the world's top three - Novak Djokovic, Andy Murray and Stanislas Wawrinka - plus big-serving sixth-ranked Canadian Milos Raonic in London, the ATP said in a statement.