Hyderabad opener Tanmay Agarwal broke the world record for the fastest triple-hundred in the history of first-class cricket in a Ranji Trophy Plate Group match against Arunachal Pradesh here on Friday.

The 28-year-old reached the milestone off only 147 balls, beating the previous record of South African cricketer Marco Marais, who had achieved in 191 balls during the game between Border and Western Province.