Smith also grabbed the Orange Cap for being the highest run-getter so far. He has scored 122 runs in three matches.
"I never get tired of batting," said Smith when asked about his impressive run of form.
Talking about his style of batting, Smith, who was also declared Man of the Match, said, "I am doing it consistently now, moving across my stumps, it is working, no need to change it."
Mumbai skipper Rohit Sharma, who now has lost all three matches so far, blamed batting for defeat.
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"We did not start well with the bat, poor performance with the bat, thanks to Corey and Polly for bringing us back in the game. I think it was a decent score, not a great one but something to bowl at. Royals batted well. We have some work to do," he said.
"We have to take responsibility with bat and be a little disciplined with ball."