"Yes, it's frustrating. I've got a five or six starts, three fifties but did not carry on by getting out to careless shots," Smith said of his 28-ball 68 against Chennai Super Kings in the previous match.
"But I've this on back of my mind. We take every game as it comes. Just look forward and don't look back."
Chasing 193, Mumbai had a flying start with Smith's quick-fire half-century but things changed as they choked under pressure, suffering a 48-run loss which meant they need to a win against Rajasthan for a place in the final.
Smith said it was just any other match as they would look to go out there and perform in the game.
"It's just about going there and feeling confident. No added pressure. All of us want to get into the final. There will be equal pressure on the opponents as they would have to beat us to be in the final.
"We have beaten them once and they have also beaten us. We will go there and do our best. Cricket is a funny game. We just stumbled and fell short. I'm sure the other guys will correct that in this game," he said.