The Sunrisers won two out of five matches in UAE and started their campaign in India with a loss against Royal Challengers Bangalore but Kumar's four-wicket haul last night helped them to bring their campaign back on track.
Kumar said the win could not have come at a better time and it will keep them in "good frame of mind" for rest of the tournament.
"There are still a lot of matches to go and you never know the Sunrisers could well turn the tables," he added.
Kumar said despite a low score on board they were confident of defending the total.
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"We have one of the best bowling line-ups in the IPL and we knew the wicket was not easy to bat on. It was a slow wicket and a turning one and we were confident that we could defend the low score," he said.
Kumar said it was a complete bowling performance by his side last night and also lauded the fielders for their brilliant show.
"Dale Steyn and I got the team off to a good start, whereas Karn Sharma and Amit Mishra kept it tight in the middle overs, which was very crucial. Towards the death, Dale, Irfan Pathan and myself again got wickets when needed to round off a complete bowling performance by the side," Kumar was quoted as saying in the IPL official website.