The cynosure of all eyes on the day was Nair as, he, apart from scoring a ton, was also involved in two century partnerships at crucial points in the game, which helped Karnataka steady their wobbly ship.
Put in to bat by UP, Karnataka lost three of their top order batsmen for a duck each.
Out of Karnataka's total of 297 on day one, three batsmen -- Uthappa, Nair and Gautam -- scored 289 runs.
Uthappa, who came back into the side after recovering from a hamstring injury, batted fluently inspite of the early blows the hosts suffered in the morning session at Chinnaswamy stadium.
Uthappa scored 100 in 160 balls with 19 boundaries to his credit, before giving a catch to wicketkeeper Elavya Dwivedi off slow left-arm bowler Ali Murtaza.
His partnership with Nair enabled Karnataka to make a comeback into the match after Manish Pandey (0), Lokeh Rahul (0) and Ravikumar Samarth (0) made a long march back to the pavillion.
