Binny and Gautam were still going strong on 115 and 132 and they have so far shared 215 runs for the unfinished fifth wicket stand to take Karnataka to 306 for four at the draw of stumps.
Thanks to Binny and Gautam, Karnataka, who still have an outside chance to make it to the quarterfinals, recovered against relegation candidates Maharashtra.
From 18 for two and then 91 for four just after lunch break, the visitors made a remarkable recovery to end the day on a comfortable position.
Binny was the more agressive of the duo as he consumed just 142 balls from which he hit 13 fours and two sixes. Gautam, on the other hand, took 261 balls for his unbeaten 132 and hit 15 fours and a six.
Maharashtra captain Rohit Motwani's decision to field first at Subrata Roy Sahara Stadium initially looked like paying dividends but it backfired later as Gautam and Binny denied the home side any success for most past of the second session and the whole of the final session of the day.
It was a leather-hunt for Maharashtra players after number five Karnataka batsman Ganesh Satish (6) was run out early in the second session.
For Maharashtra, Shrikant Mundhe, Sachin Chaudhari and Satyajeet Bachhav took a wicket each.
Brief Scores:
Karnataka 1st Innings: 306 for four in 89 overs (Muralidharen Gautam 132 batting, Stuart Binny 115).
