Uthappa was first dropped at the score of 5 by R Aswin at deep cover and later Murali Vijay missed a simple catch at long on, when he was at 25.
Robin batted really well but we dropped two catches of his - that made the difference, Raina said after the match.Uthappa's blitzkrieg and R Vinay Kumar's four-wicket haul helped RCB beat CSK by 36 runs in the Indian Premiere League.
Raina said that the last two defeats have laid bare their batting weakness and they have to really work hard to bounce back from here on.
We didn't bat well in the middle. We have to work on batting, two games we haven't chased well and we also need to think about batting line-up. Hopefully we will do well in the next game. We have to work hard in the practice, he added.
Winning captain Anil Kumble, meanwhile, heaped praise on his team for playing as a unit. It's great to win at home and in front of the full house. Robin played exceptionally well and the bowling unit - all of us bowled very well, Kumble said.
I am really proud of the way we played today. No matter what you have strategy you have outside the field, I am really pleased how we are executing our plans on the field, he added.
Man of the match Uthappa said it was a difficult track to bat on but they struck to their plan well. We just wanted to make sure we had wickets in the end so that we can go after bowling in the end. The wicket was bit difficult to bat on.
It had some spongy bounce, you needed to get set before you went after the bowling, Uthappa said. Everything went according to plan. The team environment has been phenomenal. Anil has brought the boys together really well and the internationals have really helped the atmosphere, he added.