Tiwary focussed on his game as Bengal scored 217 for four in their second essay after being precariously placed at 29/3 at one point.
A target of 326 in 44 overs was unachievable as Delhi were 161 for 4 when it was decided that match would be called off. Debutant Rishabh Pant scored an attractive 57.
In fact, the bad blood between the two teams was evident as Delhi continued batting during mandatory overs knowing that match was dead as contest.
Bengal started the day at 47 for three, with Manoj in company of nightwatchman Aamir Gani (62) and the duo added 144 runs for 4th wicket.
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The former India U-19 cricketer showed maturity beyond his age as his well compiled knock was a big reason for Bengal keeping their three points intact.
While Manoj faced 199 balls to hit 97 with 11 fours and a six, Gani consumed 142 balls hitting eight boundaries and a six. More importantly the gutsy youngster batted for three hours and quarter to shut Delhi out of competition.
Manoj on the other hand took on left-arm spinner Manan Sharma completing his half-century with a huge six. However the loudest cheer from dressing room was reserved for Gani, who completed his 50 with a single.
Manoj looked good for his hundred as he played a deft late cut off pacer Sumit Narwal. It was another such shot off the bowler that wasn't executed well as Yogesh Nagar at slip jumped to catch the ball and Bengal declared their innings.
Delhi 249 & (target 326) 161/4 (Rishabh Pant 57). Match drawn. Pts Delhi 1 Bengal 3.