Reginae has caused an upset as heavy race favourite More Sundays disappointed in his Randwick debut.

More Sundays, the $2 favourite, failed to fire in the ATC Heritage Society Handicap (1300m) after his impressive first-up win at Geelong, with Reginae powering to the post to score by 1-1/2 lengths on Saturday.

The three-year-old filly, backed into $9 after opening at $15, has impressed trainer Kris Lees after scoring a maiden win at Kembla Grange two weeks ago.

"She was really good on her first-up run this preparation," Lees said on Reginae.

"She trained on the right way. I thought it was a really strong race on paper.

"It was a terrific ride from Corey (Brown) with that good gate."

Lees is setting Reginae for big things.

"She's really bombproof. She's a filly with a lot of upside and she's got a bright future," he said.

"She's a bit of sleeper. She's got a terrific attitude. She's always shown us that we can get her out to a mile.

"She's probably looking at some of the better races down the track."

James Cummins-trained duo Condemned ($21) and Rainer ($7.5) stormed home to round out the placings.

More Sundays was second on the turn but fell back in the field to finish seventh.