Electing to bat after winning the toss, Kerala rode on a big partnership between the aggressive Vinod and Rahul.
Opener Vinod was in fine nick and hammered 11 fours and nine sixers and put on 108 with Rahul in 23.5 overs for the second wicket before he retired hurt.
For Assam, off-spinner Ryan Parag took three for 73, while left-arm spinner Rahul Singh and left-arm medium pacer Mrimoy Dutta picked up two wicket each.
Chaitanya Bishnoi brought Haryana back into the game after Jackson's ton with a five-wicket haul. The left-arm spinner was well supported by leggie Rahul Tewatia.
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In reply, Haryana was 101 for 4 in 38 overs and need another 136 runs in 52 overs to secure a victory.
There was another centurion on the day as Baroda's Abhijit Karambelkar made 100 to enable Baroda make 308 for 8 in the quota of 90 overs against Hyderabad.
Brief scores: Kerala 380 in 87.4 overs (Vishnu Vinod 138 (132b, 11x4, 9x6), P Rahul 102 (211b, 10x4), Akshay Chandran 26, Ryan Parag 3 for 73, Rahul Singh 2 for 87, Mrimoy Dutta 2 for 87) vs Assam at stumps on day one.
Saurashtra 236 in 52 overs (Snell Patel 69 (113b, 9x4), Sheldon Jackson 120 (106b, 10x4, 7x6), Samarth Vyas 30, Ashish Hooda 2 for 35, Chaitanya Bishnoi 5 for 26 Rahul Tewatia 2 for 65) vs Haryana 101 for 4 in 38 overs (Guntash Veer Singh 29 batting, Rohit Sharma 25 batting).
Mumbai 235 in 70.3 overs (Jay Bista 39, Hardik Tamore 72 (118b, 10x4, 1x6), Ashaysar Desai 59 not out (125b, 9x4), Shivam Dubey 30, Zeeshan Ansari 5 for 78, Imtiyaz Ahmad 3 for 35) vs UPCA 43 for 1 in 17 overs (Mohd Saif 28 batting).
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