Gayle scored 67 from 38 balls at Gros Islet, hitting seven sixes and four boundaries. Gayle's first T20I fifty since 2016 was a world-record-breaking performance.
When he reached fifty off 33 balls against Australia, the left-hander, who was already the top run-scorer in the shortest format, surpassed the milestone of 14000 runs.
Gayle has 14038 runs in 431 T20 outings so far. Kieron Pollard, who has 10836 runs in 545 T20 matches, is second on the list of most runs in T20s. Only four cricketers have scored more than 10,000 runs in T20 cricket, with Gayle being the first. Gayle also holds the record for most T20 hundreds (22) in the shortest format.
Gayle's brilliant batting performance at No. 3 helped West Indies knock down the 142-run goal in 14.5 overs and grab a dominating 3-0 series lead.
Here's how Twitter responded to Gayle becoming the first cricketer to reach the 14000-run mark in T20 cricket.
"It's a great journey. I'm so happy and so pleased to get a series win. I just want to commend stand-in captain Pooran for winning a fantastic series against a great team," Gayle said.
After winning the toss and electing to bat first, Australia made a strong start before opener Matthew Wade (23) and Mitchell Marsh (nine) were bowled by Obed McCoy and Fabian Allen, respectively, as the visitors reached 72-2 in 10 overs.
In the 12th over, leg-spinner Hayden Walsh dismissed Alex Carey (13) and skipper Aaron Finch (30), leaving Australia at 80-4, but Henriques and Turner staged a recovery.
Before Henriques was caught at deep mid-wicket by Allen off Dwayne Bravo in the final over and Turner was run out, the pair put up 59 runs for the fifth wicket.