Career
On 18 October 2010, Kontinen reached his best singles rankings of world number 220. On 27 April 2015, he peaked at world number 29 in the doubles rankings. He reached the final of the 2008 Wimbledon boys" singles which he lost to Grigor Dimitrov.
He also reached the final of the 2008 United States Open boys" doubles with Christopher Rungkat.
Together with Zheng Jie he reached semifinals of mixed doubles at the 2015 French Open. Together with Peers he reached the second round of the 2016 Australian Open for the first time in his career.