Kei Nishikori started playing tennis at the age of five. In 2001, he won All-Japan Selected Junior Tennis Championship in May, All-Japan Elementary School Tennis Championship in July and All Japan Junior Tennis Championship (Under 12) in August. He was the 5th player ever to win these 3 Championships.
In 2003, Kei was selected as a certified player for Masaaki Morita Tennis Fund and joined IMG Academy in Florida. Then he started out for Junior circuit all over the world as Florida his home base.
He turned professional at Japan Open in October 2007. His first win in ATP Tour came in February 2008 at the international championship in Delray Beach. He went on to reach the round of 16 at US Open in August, first in 71 years as a Japanese male singles player, and received 2008 ATP Newcomer of the Year award. In 2009, he suffered a stress fracture in his right elbow and could not compete from April. After long, hard rehabilitation, he returned to the Tour in February 2010. He won several tournaments in Challenger circuit and came back to top 100 in ranking by the end of 2010.
After reaching semi final in Shanghai Masters, Nishikori broke the record-high ranking for Japanese man by Shuzo Matsuoka, No. 46, by reaching No. 30. Right after Shanghai, he had an impressive win over No. 1 ranked Novak Djokovic in the semifinal of Swiss Indoor championship.
In 2012, after reaching quarter final in Australian Open, his ranking rose to No. 20. He represented Japan in Olympic Games in London, got to quarter final and finished 5th. He won Rakuten Japan Open in October in front of his adoring Japanese fans, his second ATP Tour title.
In 2013 Kei won in Memphis, his third ATP Tour title. Then he played as ace of Team Japan in Davis Cup, contributed for Japan to get in World Group.
In 2014, he won Memphis title for 2 years in a row, got to semi final at Miami Masters, won ATP 500 title in Barcelona, reached final at Madrid Masters and finally broke into world top 10, reaching No. 9 in world ranking on May 12. At US Open, after defeating several higher-ranked players, Kei reached final for the first time as Asian male player in a Grand Slam.
After that, he won 2 titles in 2 consecutive weeks, at Malaysia Open and Rakuten Japan Open. Kei got qualified for ATP World Tour Finals as one of top 8 ranking-point getters of the year, got 2 wins in round-robin and reached semi-final, finishing the year as No. 5 in ranking.
In 2015, he won his third Memphis title in 3 years, reached final at Mexico Open right after and became No. 4, the highest ranking so far in his career. In April he successfully defended his Barcelona Open title. In July, Kei won an ATP500 event in Washington and at the end of the season he played in ATP World Tour Finals for 2nd consecutive year.
In 2016, Kei won Memphis Open title for 4 years in a row, which was his 11th career win.
Residence: Bradenton, Florida. United States Training base:
Coaching: Dante Bottini, Michael Chang
Trainer: Koichi Nakao
Manager: Olivier van Lindonk
:: Kei Nishikori Equipment
Racquet: WILSON STEAM 95
Shoes: adipower barricade 8+
Tennis clothes: UNIQLO
Strings: Wilson Natural 1.30mm / Luxilon 4G 1.25mm