Saurashtra still trail Tamil Nadu, who had declared their first innings at 565 for eight, by 239 runs.
Meanwhile, Baroda, Punjab and Himachal Pradesh scored outright victories with a day to spare.
Baroda registered a massive 246 runs over Madhya Pradesh in a match that saw 40 wickets falling inside three days.
Chasing 135, Punjab, who resumed the day 117 for five, got the 18 runs losing two wickets to register a three wicket win over hosts Haryana.
In Dharmasla, Himachal Pradesh completed a big innings and 221-run win over Assam to get an additional bonus point.