This sets up a mouthwatering clash with Gary Anderson. He said he did the right things at the right moments which is why he won.
On his clash with Anderson, he said he needs to stay focused ahead of it.
"I think I did the right things at the right moments," said Van Gerwen. "The beginning was phenomenal for both of us, we kept each other under pressure.
"I'm really glad I did it at the end, I had a couple of good legs to take the lead and give myself that confidence.
"My scoring power and doubles weren't as good as the last games so they have to be better in the next one. I didn't play my best game but I still averaged 101 and I'm glad that I won.
"Jonny has made some huge steps in this tournament. He beat me in the group and gave me a really good game here as well."
Van Gerwen added: "For a lot of people it's going to be the game of the tournament.
"Me and Gary are the best two players in the world and we are going to have a great battle.
"The winner has got a massive chance to win this tournament. We both know that and we need to keep our heads focused tomorrow.
"I could be the first player to win four times in a row, but that's something to worry about tomorrow."
The prize fund breakdown for this tournament can be found here. Click here for more information about the Grand Slam of Darts.
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