WA sealed their 18th Shield title just 10 minutes before stumps in fitting fashion when Joel Paris took a blinder of a catch at gully to trigger scenes of jubilation on the field and in the terraces.

"We were on a shot clock, we were really hoping to finish it tonight," Whiteman told reporters. "That final catch and that celebration... was just an amazing feeling that I'll never forget."

He replaced Cameron Bancroft, arguably WA's best batter and the leading Shield run scorer over the past couple of seasons. Bancorft had been ruled out ahead of the final after suffering concussion in a bike accident last weekend.

"The way someone stood up when we really needed to throughout the year, it's been amazing," said Whiteman, who was player-of-the-final with his opening day century after WA were sent in to bat on a green-tinged surface. "The most pleasing part of it is that it's often someone else who stepped up.

"We've had a tough slog this year with injuries and Australian selection. I'm just incredibly proud of the group."

Whiteman, now a three-time Shield-winning captain, believed the latest triumph was WA's sweetest. Adding to their legacy, they became the first team to win three titles in a row in the Shield and Marsh Cup concurrently.

WA won their first hat-trick of Shield titles since their legendary team of the late 1980s, which boasted Terry Alderman, Tom Moody and Geoff Marsh.

"Personally, it is [the sweetest title]," Whiteman said. "It has to be one of the great WA Shield teams....and I think with the one-day stuff we have to be one of the great WA teams. Hopefully there's some more success down the line."