In the Border-Gavaskar series against Australia in 2013, Dhoni became the first Indian wicket-keeper to hit a double hundred in Tests when he smashed 224 in the first Test at Chennai - the best knock of his career. In the same series, Dhoni surpassed Sourav Ganguly's record of 21 Test wins and became the most successful Test captain for India. Under his captaincy, India became the first team in more than 40 years to whitewash Australia in a Test series.