India off-spinner Ravichandran Ashwin replaced veteran England pacer James Anderson as the new World No.1 bowler in Tests. The off-spinner jumped two places after taking six wickets in India's six-wicket win against Australia in the second Test of the four-match series in Delhi.

from Times of India https://timesofindia.indiatimes.com/sports/cricket/news/ravichandran-ashwin-replaces-james-anderson-as-world-no-1-test-bowler/articleshow/98332124.cms