It was an off day for Jharkhand captain Mahendra Singh Dhoni, who struggled in his 47-ball 28 (4x3) before being bowled by left-arm spinner Mehdi Hasan in their modest 204-run chase.
Cruising to his second century in three matches, and fourth overall in List A, Saurabh slammed 102 from 104 balls. His knock was studded with seven sixes and five fours and Jharkhand needed 31 runs from 70 balls.
But Jharkhand collapsed after Saurabh holed out to Chama Milind at third man in the 39th over. Jharkhand lost six wickets for 44 runs in a stunning collapse to fold for 182 in 44.4 overs.
Karnataka and Hyderabad have 16 points each.
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Having lost two from five matches, Jharkhand (12 points) will now have to post a big win against Jammu and Kashmir at Bengal Cricket Academy in Kalyani on March 6 to keep their hopes alive.
Earlier hundreds packed the ground located inside JU second campus and shouted 'Dhoni, Dhoni' who came in to bat after a familiar collapse left Jharkhand at 68/4 in 17.3 overs.
Before he could make it big Hasan bounced castled Dhoni to break the partnership for 70 runs that triggered the collapse.
Saurabh, however, remained unperturbed and counter-attacked Hasan slamming the left-arm spinner for three sixes and one boundary in the 37th over that yielded 23 runs.
Earlier Hyderabad were restricted to 203/8 in the stipulated 50 overs as their batsmen struggled to get going on a slow and low wicket after they were sent in by Dhoni.
Sumanth Kolla (48) was Hyderabad's top-scorer, while Bavanaka Sandeep (43) lent fine support at the other end in an 82-run third wicket partnership.
Meanwhile, Karnataka continued their winning streak and routed Jammu and Kashmir by seven wickets with 194 balls to spare to consolidate their position atop the standings and virtually qualify for the quarterfinals from group D.
Put in to bat, Jammu and Kashmir were shot out for 108 in 28.4 overs with rookie medium-pacer Prasidh Krishna returning with career-best figures of 4/15.
Karnataka chased down the target in 17.4 overs with IPL's Rs 2 crore pick, K Gowtham, slamming an unbeaten 57 from 46 balls (9x4, 1x6).
At Jadavpur University Second Campus ground, Saltlake: Hyderabad 203/8; 50 overs (Sumnath Kolla 48, Bavanaka Sandeep 43; Shahbaz Nadeem 3/27, Kaushal Singh 2/31) beat Jharkhand 182; 44.4 overs (Saurabh Tiwary 102; Mehdi Hasan 3/40, Chama Milind 2/26, Akash Bhandari 2/28, Ravi Kiran 2/38) by 21 runs.
At Eden Gardens: Saurashtra 279/9; 50 overs (Sheldon Jackson 73, Chirag Jani, Dharmendrasinh Jadeja 50, Harvik Desai 48; Pankaj Rao 4/34) beat Chhattisgarh 187; 44 overs (Manoj Singh 55; Prerak Mankad 3/37, Jaydev Unadkat 2/24, Kushang Patel 2/33) by 92 runs.
At Bengal Cricket Academy, Kalyani: Jammu and Kashmir 108; 28.4 overs (Prasidh Krishna 4/15, Stuart Binny 2/30) lost to Karnataka 110/3; 17.4 runs (K Gowtham 53 not out; Mohammad Mudhasir 3/53) by seven wickets.