"I didn't start well with the bat and I'm certainly to blame, getting out in the first over," Watson said after Punjab overhauled the 149-run target in just 14.3 overs with eight wickets in hand.
Opening the innings, Watson was dismissed in the first over by Axar Patel. In fact, RCB were 22-3 in five overs but a superb 46-ball 89-run unbeaten innings by AB de Villiers took Bangalore to 148-4.
"A few more than 170-180 would have been nice," Watson said.
"We didn't even execute nicely with the ball. There was a little bit more dew than I thought there would be and it was skidding along more in the second innings," Watson said.
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Punjab skipper Maxwell credited the bowlers for setting up the win for them.
"Feeling good. It's been a great start for us. The bowlers set it up for us. To keep it to 23 in the powerplay was a great effort," he said.
This was Punjab's second win in the season. They had beaten Rising Pune Supergiant by six wickets in their first match.