Mitch Marsh is loving the opportunity to bat at first drop for Australia doesn’t want to look any further than “the now”.

Fresh off a man-of-the-match performance for his country in Thursday’s drought-breaking T20 win over the West Indies in St Lucia, the WA captain said he was enjoying the chance to go hard against the new ball.

And it’s showing in his performances.

The 29-year-old didn’t have a T20I half-century to his name heading into the series. Now he’s got three.

Marsh starred with bat and ball as the tourists got over the line by four runs in a see-sawing fourth game of the series, avoiding any chance of a whitewash.

Marsh plundered a career-best 44-ball 75, which included six sixes and four fours, to steer Australia to their best score of the series of 6-189.

He combined for a 114-run second-wicket stand off 63 balls with skipper Aaron Finch (53 off 37).

He backed that up with another first with the ball - the first three-wicket innings of his 24-game T20 international career.

Top-order batsmen David Warner, Steve Smith, Marcus Stoinis and Glenn Maxwell were among seven first-choice Australian limited-overs player with withdraw ahead of the tour, giving a golden opportunity for Marsh’s promotion up the order.

But he insisted his focus was more on winning games of cricket for his country than securing a spot in the T20 World Cup squad in the UAE in October.

“I’m certainly loving the opportunity to bat up the top of the order and I certainly think that as we’ve seen, batting against the new ball is the time to really get after it and try to get ahead of the game,” Marsh said.

“I’m really enjoying the role but like I said the other night, it’s purely based on, with the World Cup coming up, the focus on the now and playing my role.

“I know that sounds cliche but that’s literally all I’m doing, I’m trying to do that to the best of my ability and help win games of cricket for Australia.”

Marsh’s 3-24 off four overs including the wickets of set batsmen Lendl Simmons (72 off 48 balls) and Nicholas Pooran (15 off 14) in consecutive deliveries in the 16th over to turn the game on its head.

Earlier, he bagged the prized scalp of game-three hero Chris Gayle for one with the second ball of his spell, well caught on the boundary by WA and Scorchers teammate Jason Behrendorff.

“I’m really happy to contribute with both bat and ball,” Marsh said.

“I think as an allrounder it’s pretty rare that you get a game where you get an opportunity to really get stuck in with both bat and ball so I’m really pleased.

“But most importantly, to get a win after going 3-0 down was really important for this young group moving forward for the rest of this tour.

The hosts needed 11 runs off the final over for victory after some late lusty blows from Fabian Allen (29 off 14) and Andre Russell (24 not out off 13), but could only manage six as experienced speedster Mitchell Starc held his nerve.

The previous over, the Allen-Russell combo smashed plundering 25 off young Tasmanian quick Riley Meredith.