Australia leg-spinner Adam Zampa became the first Aussie male (and third overall) to reach 100 T20 international wickets with a four-wicket haul against Namibia in their T20 World Cup clash in Antigua on Tuesday.

Zampa led Australia's rout of an outclassed Namibian batting line-up with the southern Africans bundled out for just 72 off 17 overs batting first in their Group B match at the Sir Vivian Richards Stadium.

Put in to bat in breezy, drizzly conditions, Namibia were first strangled by the 2021 champions' efficiency with their new ball bowlers and safe catching before Zampa took over, the leg-spinner ripping through the lower half of the line-up to finish with the outstanding figures of four for 12.

That fourth wicket came off the last ball of his four-over spell when he bowled Bernard Scholtz comprehensively for a duck to become the first Australian male to reach the milestone of 100 T20 International wickets.

"I bowled a couple of pies (bad balls) tonight to get a couple wickets but that happens at times," said Zampa after receiving the Man of the Match award.

"I've been feeling really good and encouraged by the captain to take wickets through those middle overs. It is a bit of a challenge here in the Caribbean but it's something you have to cope with for sure.

"This is the first step in trying to take the trophy home, but there is a long way to go," he added.

Having started the tournament with wins over Oman and England, unbeaten Australia stormed into the Super 8s with one Group B match to spare after hammering Namibia by nine wickets.