Chasing 137 for a win, Vidarbha produced a solid batting display to overhaul the target with three balls to spare at the VCA Stadium at Jamtha here.
Jitesh Sharma (24) and Faiz Fazal (37) stitched 41 runs for the opening wicket in 5.6 overs to give Vidarbha a solid start.
After Sharma's dismissal, captain Fazal and Joshi shared 54 runs for the second wicket to take Vidarbha closer to victory.
Joshi, who struck six boundaries and two sixes in his 46-ball unbeaten knock, got an able ally in Apoorv Wankhade (13 not out) as the duo took Vidarbha home by reaching 140 for 2 in 19.3 overs.
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Mohit Hooda top-scored with a 56-ball 65 which he made with the help of four boundaries and two sixes. Sehwag made just one run from the four balls he faced.
For Vidarbha, Rajneesh Gurbani and Ravi Jangid grabbed three wickets apiece while Ravikumar Thakur got one wicket.
Brief Scores:
Haryana: 136/8 in 20 overs (Mohit Hooda 65; Ravi Jangid 3/13, Rajneesh Gurbani 3/24)
Vidarbha: 140/2 in 19.3 overs (Himanshu Joshi 61 not out; Yuzvendra Chahal 1/27).