Vidarbha 379 and 249 for 4 (Nair 132*, Malewar 73) lead Kerala 342 (Baby 98, Sarwate 79, Nalkande 3-52, Rekhade 3-65, Dubey 3-88) by 286 runs

If fate had played out differently two seasons ago, Karun Nair would have been playing for Kerala after he first reached out to them when he was dumped unceremoniously by Karnataka. They couldn't commit at the time and Nair, having sat at home for an entire season, couldn't wait to grab his next opportunity. That's when Vidarbha came calling.

Two seasons on, Nair is at the forefront of Vidarbha's charge to a third Ranji Trophy title, having batted all day to construct an unbeaten 132, his 23rd first-class century and fourth of the season. It helped stretch Vidarbha's lead to 286 at stumps on the fourth day, and they still have six wickets remaining. If Nair does lift the trophy, it'll be his third - his first two were with Karnataka in his first two seasons, 2013-14 and 2014-15.

Nair shouldn't batted this long, but luck shone on him. On 31, in the very first session on the third day, indecision against young seamer Eden Apple Tom had him playing at one that reared up awkwardly to lob off the glove to first slip where Akshay Chandran put down a dolly. Having already lost two early wickets, Vidarbha would have been 55 for 3. Instead, Kerala saw Nair and Danish Malewar, the 21-year-old batter in his maiden season, torment them again, as if to complete the business they had left unfinished in the first innings when a mix-up between the two led to Nair's run out for 86.

Malewar and Nair put on 182 for the third wicket - Malewar making 73 to go with his 153 in the first innings - to defuse any tension there might have been in the Vidarbha camp after they lost Parth Rekhade and Dhruv Shorey inside the first three overs. Rekhade was bowled through the gate by Jalaj Saxena's in-drift, and Shorey was out to Mohammed Azharuddeen's brilliance as he dived full stretch to pluck a healthy edge in front of first slip to give MD Nidheesh an early wicket.

Kerala could have had a third very quickly, but Malewar was aided by luck when DRS deemed a not-out lbw decision off Saxena to be umpire's call. It was the start of a frustrating few hours for Kerala, where they dropped a sitter of a big-match player, two of their frontline seamers - Nidheesh and Nedumankuzhy Basil - received warnings twice for running on to the danger area of the pitch, and then saw two healthy nicks off Saxena, their most prolific and in-form spinner, go through the vacant slip cordon when the need of the hour was to attack, not defend. All these factors combined to give Vidarbha the push they needed.

In the seventh over of the day, Malewar survived again, this time overturning an lbw call on DRS after being given out to Nidheesh, with replays showing the ball swung in late and would have missed leg stump. Things were happening quickly, and Kerala should have remained on the offensive. They didn't and paid the price.

Nair was good enough to pick gaps through the covers as Kerala left the off side open to have him drive against the turn. His ability to mix that up by playing a superb reverse sweep all along the ground made him a tough prospect to bowl to. Malewar's temperament stood out as he absorbed the pressure from Saxena and played largely within himself until he got to his half-century and then stepped out to play a glorious drive over mid-off.

As the partnership grew, Kerala resorted to a leg-stump line briefly to try to unsettle the batters. But given Vidarbha were sitting pretty with a lead, realisation dawned for Kerala that they needed to be a little more on the offensive, by which time the pair had already put on 100 runs.

Nair survived on 65 when a leading edge off Saxena didn't carry to the bowler, and he responded by offsetting any pressure by playing the reverse sweep. En route, he went past the 800-run mark for the season and charged into the 80s by hitting Aditya Sarwate for two back-to-back sixes - one over long-on and one over long-off. As he brought up his century, Nair dropped his bat, removed his gloves and showed nine fingers towards the dressing room to signal his nine hundreds across the season, before taking guard and continuing to blunt the bowling.

It needed Chandran's left-arm, part-time spin to break the mammoth stand when Malewar jabbed at one that flicked the glove and lobbed to Sachin Baby at slip. Then Yash Rathod came out and battled serenely with Nair, and at one point in the final session, overtook Madhya Pradesh batter Shubham Sharma's tally of 943 to lead the run charts for the season.

Then a sharp turner from Sarwate spun back in to trap him lbw, a decision that Kerala got overturned in their favour through the DRS. But moments like those were few and far amid a largely frustrating day for Kerala, whose hopes of a maiden title seem all but gone, with them needing a miracle to make a match of this on the final day.