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England captain Joe Root has returned to the top of the ICC's Test batting rankings for the first time in six years.
He replaces New Zealand's Kane Williamson, who drops to second.
Root said he was "proud" to have reached the milestone, but hopes his best form is "still to come".
He began the series against India in fifth but a run of sublime performances has propelled him up the list.
"As nice as it is, there's still so much hard work to do," he said.
"The focus doesn't change, it's all about continuing to get better, continuing scoring runs and hopefully setting up games to win Test matches.
"I suppose it would be nice to be able to stay there now [at number one]," he added.
Australia's Steve Smith is third, ahead of compatriot Marnus Labuschagne.
India opener Rohit Sharma completes the top five, overtaking his captain Virat Kohli, who has had a subdued series in England.
England's record breaking swing bowler James Anderson returns to the top five in the Test bowling rankings after his consistent performance against India.
The series is level at 1-1 going into the fourth Test at the Kia Oval in London from Thursday.
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