Unadkat, Sanandia and Jani shone for Saurashtra on the traditionally seamer-friendly conditions here.
After Haryana resumed on 93 for six, Unadkat and Jani shared four wickets between them, which were left, to warp off the match before lunch.
Overnight half-centurion Chaitanya Bishnoi (56) could add just three more runs to his last night's score.
Forced to follow on after being bundled out for 107 in their first innings, Haryana's batsmen failed to show any improvement in their second essay as well, except Bishnoi.
Saurashtra could register an innings victory despite scoring less than 300 runs when they had batted in their only innings in the match.
Saurashtra had made 278.
Brief scores: Saurashtra: 278 Haryana: 107 & 140 all out (Chaitanya Bishnoi 56; Jaydev Unadkat 3/55, Shaurya Sanandia 2/18, Chirag Jani 2/12).
In Thiruvananthapuram, Kerala vs Jharkhand: Kerala won by 9 wickets
Jharkhand: 202 & 89 (Jalaj S Saxena 5/27, Karaparambil Monish 4/42).
Kerala: 259 & 34 for 1 (KB Arun Karthik 27).
In Jaipur, Rajasthan vs J&K: Rajasthan 1st innings: 330 J&K 1st innings: 432 for 6 (Ahmed Bandy 102, Parvez Rasool 97).
First Published: October 8, 2017, 7:25 PM IST