2006 - Played first events of career on ITF Circuit in Japan.
2007 - Did not play.
2008 - Played first WTA qualifying at Tokyo [Pan Pacific] and Tokyo [Japan Open] (both as WC); won one singles title and two doubles titles on ITF Circuit.
2009 - Played first WTA main draw, reaching 2r at Osaka (as WC); won one singles title and one doubles title on ITF Circuit.
2010 - Reached 2r once (
Wimbledon); fell 1r six times (incl.
Roland Garros) and in qualifying seven times (incl.
Australian Open); won one singles title on ITF Circuit.
2011 - Reached 2r once; fell 1r three times and in qualifying seven times (incl. all four majors); won one singles title on ITF Circuit.