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Rahul followed up scores of 33, 39 and 39 with a blistering 53-ball 82 that included nine fours and three sixes to help his side to an eight-wicket win over defending champions Chennai Super Kings.
Rahul (82) and De Kock (54) batted with authority during their match-winning alliance of 134, the highest partnership for any wicket at the Ekana Stadium, as LSG recovered from back-to-back loss and consolidate their position in the table.
Mayank struck when things were starting to look bleak for LSG, getting rid of Bairstow, Prabhsimran Singh and Jitesh Sharma to return figures of 3/27.
K L Rahul remains sidelined since hurting himself in the opening Test in Hyderabad.
India's premier pacer Jasprit Bumrah, who was rested for the Ranchi Test, is expected to lead the attack at the HPCA Stadium.
Rahul has been battling fitness issues and missed the last two test matches.
Devdutt Padikkal replaced Rahul in the squad.
The injured duo of batter K L Rahul and all-rounder Ravindra Jadeja were recalled to the squad but will play subject to fitness clearance from the medical team.
Jadeja sustained a hamstring injury while K L Rahul has complained of pain in right quadriceps.
India, who have not lost a Test series at home since 2012, finished day two on 421/7 in their robust reply to England's middling 246 in the first innings.