Batting against Jharkhand, Pant achieved his century off just 48 balls and broke the previous record of 56 balls held by two cricketers.
He had scored 117 off 106 balls in the first innings. His record innings saw six fours and ten sixes.
Pant has hit 13 sixes and 8 fours in his 66-ball unbeaten 135 at the time of going for lunch on day four of the match, reports Cricket Country.
His extraordinary effort has put Delhi ahead in the match by 215 runs.
Few days back, Pant scored a triple century off 326 balls. Rishabh slammed 42 fours and 8 sixes during his magical innings.
Pant has already scored 799 runs this reason and is topping the batting charts.
One of the previous fastest first class cricket centuries was scored by former Tamil Nadu batsman VB Chandrashekhar during the 1988-89 Irani Trophy.
The left-handed batsman was earlier bought by IPL franchise Delhi Daredevils for 1.9 crore.