Kei Nishikori is a top-class professional tennis player from Japan with a world ranking of no. 6 as of February 2016. He has the distinction of being the only male Japanese tennis player to be ranked inside the top-10 in ATP Singles Ranking.
Nishikori started playing tennis at a very young age and has been steadily making his mark in the international tennis circles since then. He has won around 11 singles titles and was also the runner-up at the US Open 2014.