The first head-to-head of Australian captains in the Women's Premier League has been won by Meg Lanning, whose Delhi Capitals took down the UP Warriorz of Alyssa Healy.

Perhaps the Australian who shone brightest was Tahlia McGrath, who made a stunning 90 not out off 50 balls in a valiant attempt to pull off an improbable Warriorz victory.

But McGrath's knock, the highest of the WPL so far, could not prevent Capitals winning by 42 runs as another Aussie, Jess Jonassen, was named player of the match for her 42 off 20 with the bat and 3-43 with the ball.

Lanning had led from the front, opening the batting and smashing a 42-ball 70 to set up the Capitals' total of 4-211 in their 20 overs.

Healy also opened, and hit her first two balls for four, but she became the first of three wickets for Jonassen, dismissed for 24 off 17 balls.

"She definitely hits me a lot in the nets so good to get one up over her," Jonassen said.

"Always enjoyable to play fellow Australians."

That was the first of three wickets in six balls that left the Warriorz's reply in deep trouble.

Despite McGrath's defiance, they were unable to recover and finished on 5-169.

The prospect of Queensland's Harris sisters facing off against one another failed to materialise due to restrictions around how many overseas players can be fielded, with Capitals omitting Laura and Warriorz leaving out Grace despite her match-winning hand in their last game.