The team from Australia beat South Africa's Dolphins by six wickets.
Needing 12 off the last two deliveries, Marsh dispatched seamer Robbie Frylinck over deep mid-wicket and long-on to successfully chase down a target of 165 set up by the Dolphins.
Marsh, who was adjudged man-of-the-match for his 40 off 26 balls with three fours and two sixes, told reporters after the match that they were lucky to win in the end.
"Lucky, we were on the winning side," he said.
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Asked what was his thought after he hit the first six in the final over, Marsh said, "I knew we needed to hit the six. We had a big focus as a whole squad the whole batting unit to just have a clear mind and back ourselves, nothing changed in those last two balls. I tried to swing as hard I could and watch the ball."
Asked if stroke making was difficult or was it the case of good bowling towards the end, Marsh said, "It's a beautiful wicket to bat on. I thought they bowled really well in the end, to be honest. They bowled good yorkers and we did not get those boundaries when we needed them.