It might be a 38-hour round trip, but it would've been worth it for Savannah McCaskill's parents to watch their daughter's heroic W-League grand final performance.

McCaskill scored two goals and set up a third on Saturday to claim the player of the W-League grand final medal in Sydney FC's 4-2 triumph over Perth.

And the American did it in front of her parents, who surprised her by flying in from the United States to be part of a grand final record 6127 crowd at Jubilee Oval in Sydney.

"I thought my dad was joking. At first, I was like, 'There's no way you're flying 19 hours out here for one game'," McCaskill said.

"And he was like, 'Yeah, we are'. And I was like, 'OK'.

"They've been able to follow my entire career and have missed very few games. It's just amazing for them to be able to enjoy the moment as well."

Pre-match predictions centred on a shootout between two of the most-prolific attacks of competition, led by Matildas duo Sam Kerr and Caitlin Foord.

However, while Kerr made it onto the scoresheet with a penalty, McCaskill stole the show with a display that might catch the eye of US national selectors.

Initially, it appeared like it was going to be a tough evening for the 22-year-old when she hit the crossbar from point-blank range in the second minute.

But McCaskill responded immediately by teeing up Sofia Huerta for the opener, before showing good instinct by looping in a header for her first goal.

"First off, Caitlin put an absolute cracking of a ball in. She whipped that in perfectly and I think I caught the keeper playing the cross a bit," she said.

"I don't think she thought I was gonna be able to get my head to it so I just kind of put it on target and hoped for the best, to be honest."

Sydney FC coach Ante Juric said McCaskill had been huge all season.

"I put her on the bench one game and her response for that was superb. I give her huge credit for that and and she's a world-class player," he said.

"I'm surprised she's not in the international team but I'm sure she'll get there - she's still young."