Cramps meant we all have to wait until next time to see if the Canberra United striker can sneak past Matildas gun Sam Kerr to be the all-time W-league leading goalscorer in her own right.

Heyman was part of a clinical United side that put the formerly undefeated Brisbane Roar to the sword, smashing them 4-1 at Viking Park on Sunday.

It keeps Canberra's finals hopes alive, sitting just two points behind the fourth-placed Melbourne Victory and four behind Adelaide - who have played one game more.

Heyman's strike not only put the home side 3-0 up, but also drew her level with Kerr on 70 W-League goals.

The 32-year-old wanted to stay on, but her legs told her it was time with 20 minutes remaining.

She played slightly deeper than her usual striker role, to allow her to get a bit more space on the ball.

"I just feel lighter. I just feel happy that it's done and now I can go out and have more fun," Heyman said.

"That's literally what I said today. I'm not going to put the worries of scoring a goal [on myself], I just wanted to get out on the field and enjoy it.

"This is a must-win game, every single game from now is a must-win, so why not smile about it.

"I did want one more. [Canberra coach Vicki Linton] always looks at me and gives me a nod to see if I'm ready - 'Do you really want to come off?'

"But I started cramping. I said take me off, I don't think it's happening."

Nikki Flannery opened the scoring after just 10 minutes - her pace on the right wing had Roar defender Jamilla Rankin in all sorts of trouble.

Then Grace Maher blasted in a long-range effort that Roar goalkeeper Morgan Aquino should have done better with.

Heyman got on the end of a perfectly weighted Lauren Keir long ball to slot past Aquino.

Roar striker Emily Gielnik looked threatening all game and she headed home just before half-time.

Canberra midfielder Bianca Galic caught Aquino off her line to finish the rout.

United now travel to Perth to take on the bottom-placed Glory on Thursday night.

AT A GLANCE

CANBERRA UNITED 4 (Nikki Flannery 10, Grace Maher 23, Michelle Heyman 29, Bianca Galic 64) bt BRISBANE ROAR 1 (Emily Gielnik 44) at Viking Park. Referee: Rebecca Durcau. Crowd: 1161.