"We are fully prepared and we will win the finals. That is for sure. The losses were in the past," he told reporters in post-match press conference here.
Mumbai had lost all the three matches against Mahendra Singh Dhoni and Steve Smith's side in league stages.
Asked was there any pressure on him justify his selection over Harbhajan Singh, the Railways leg-break bowler said that the decision is not in his hands and gets motivated by the thought of performing well and winning match for the team.
Asked what was his strategy to get KKR's left-handers Sunil Narine and Gautam Gambhir, Sharma said the team had different plans for different batsmen.
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For Narine, they were asked to bowl stump to stump line as he swings his bat at every possible opportunity.
Replying to a query, Sharma said T20 is about momentum and hence the team won the game despite the wicket being a bit slow.
"It was a little bit slow. It was not like the earlier Bangalore wickets. But it was good that we bowled well from the start and got wickets. T20 is all about momentum. We started well in the first six overs and that's why we won the game," he said.
"It was a slow wicket, not a regular Bangalore wicket but getting out for 107 is not enough, we need to work hard on our batting," Chawla said.
Chawla defended the shot selection of some of the KKR batsmen.
"It (shot selection) completely depends on the batsman; if someone is good at something then they back themselves. Sometimes it pays off and sometimes it doesn't. Once you are defending 107 runs then you try and get wickets at regular intervals. We didn't bat well that's why we managed to get just 107.