Nehra who grabbed six for 16 in 10 overs took six of the first seven wickets with controlled swing bowling on a 'green top' where play was stopped for 28 minutes due to dangerous pitch conditions with one of the Vidarbha batsmen getting hit by a Parvinder Awana bouncer.
Rashmi Ranjan Parida (28) and Amol Jungade (27) were the two players who crossed 20 while other player to reach double figures was skipper Shalabh Srivastava.
At stumps, Delhi were 96 for two in reply with skipper Gautam Gambhir making 49 off 135 balls with six fours. Unmukt Chand was dismissed for 37 although he hit seven delightful boundaries.
The morning belonged to Nehra who troubled the Vidarbha batsmen with his pace and swing.
He first trapped left-handed opener Faiz Fazal (4) leg before with a delivery that came in after pitching. His opening partner, a right handed batsman Akshay Kolhar (1) got one that came in as he offered a simple catch to Rajat Bhatia at short leg. Ravi Jangid (1), skipper Shalabh Srivastava (10) and Ranjit Paradkar (0) left in successive overs as Nehra completed a five-for.