The first day of the last-eight clash against UP belonged to Uthappa and another young team-mate of his - Karun Nair, who too made exactly 100.
At the end of Wednesday's play, Uthappa at once was happy with the batting effort but at the same time rued playing a bad shot.
"I thought I let the team down in a big way by playing that shot because even though I had scored a 100 the team was 135 for 4. I will regret playing that shot. But it is a good learning for me," was the 28-year-old's reaction in the post-match press conference when queried about the way he got out.
Four balls after reaching 100, Uthappa stepped out of his crease to left-arm spinner Ali Murtaza and completely the missed the ball only for the wicketkeeper Eklavya Dwivedi to get him stumped.
The Karnataka opener had done all the hard work to get to the three-figure mark and had rebuilt the innings which was in shambles at 15/3 early in the morning.
Uthappa felt he needed to carry on from there. His departure from the pitch at 135/4 could have tilted the scales again in favour of the visiting team. But Nair and CM Gautam (89 batting) ensured that Uthappa's needless shot did not cost them dearly.
The right-hander said he had to play a cautious game early on when there was help for the bowlers with live grass on the 22-yard strip.
With Karnataka ending the day at 297/5, Uthappa said they were looking at a score of 500 tomorrow.