Chasing 208 to win, Punjab fell short by 26 runs and slipped to sixth from fifth position in the points table.
"It was chaseable. We were sloppy with the ball and in the field. We bowled either side of the wicket. There were a few soft dismissals in isolation. If you put together it looks bad," Maxwell said after the match.
The Australian praised his compatriot Shaun Marsh, who came out all guns blazing with his 84-run knock in Punjab's chase.
Winning captain David Warner was pleased with the way his batsmen responded after being asked to bat.
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"Look we had to come out with a positive mindset. The wicket played fantastic. Fantastic knock from Marsh. Shikhar wanted to play his natural game. Kane is a fantastic player. The way he comes in and plays so freely and so elegantly is great for the team," he said.
Afghanistan spinner Rashid Khan was adjudged Man of the Match for his superb spell in the middle overs.
"It is a big league and big state; just tying my best to learn from them. Murali (Muttiah Muralitharan) has been superb for me and helping me with his experience. The confidence and the motivation comes from the coach and skipper. I want to dedicate this award to my family and my brother Jalil," he said.
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