Courtesy Uthappa's 141-ball-148 that had 16 boundaries and six maximums along Mayank Agarwal's (118) maiden first-class hundred, the defending champions are in driver's seat at the end of the opening day.
The duo added 236 runs for the second wicket stand with Agarwal hitting 19 boundaries off 209 balls.
When the stumps were drawn, Manish Pandey and Karun Nair were batting on 31 runs each, with help of four and two boundaries, respectively. They stitched an unbeaten 61-run stand for the fourth wicket.
Sent into bat, Karnataka lost their first wicket of Ravikumar Samarth at 47 when he Pawan Suyal castled him with an incoming delivery.
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Uthappa joined Agarwal, and both started making runs at a quick pace of 3.43 runs per over and took Karnataka total to 120 for one at lunch.
In the post lunch session, Karnataka came out with renewed energy, and in just four overs Uthappa and Agarwal cracked 21 runs with Uthappa hitting three more boundaries and Agarwal helping himself with a boundary.
Just at the stroke of tea, Uthappa crushed Shorey for 32 runs in his very first over by smashing four huge sixes, taking his score from 102 to unbeaten 134 in a jiffy.
Karnataka 1st Innings 358/3 (Robin Uthappa 148, Mayank Agarwal 118, Pawan Suyal 2/78).