Sorry Scott and King Cratos, early favourites for the Group 1 Peter Mosman Opal and Group 1 Vic Peters Classic series which begin next Saturday, enhanced their reputations with dazzling wins at Wentworth Park on Saturday night.

The Andrew Crouch-trained Sorry Scott, top pick for the Opal, set the 520m time standard for Wentworth Park on Saturday, leading throughout in the $10,000 to the winner NSW Bred Final in 29.65sec, easily her best time at headquarters.

Not to be outdone, King Cratos, from the Jason Magri kennel, showed improved box manners to be second early before hitting the front going through the catching pen to win the Free-For-All in 29.68.

Good Odds Harada, like King Cratos a leading candidate for the Vic Peters Classic, lost no admirers by coming from fourth early to finish second in Saturday's top grade event, beaten less than a length.

Fran's Bonus, who is eligible for the Peter Mosman Opal, made the nine hours' drive from Grafton worthwhile for trainer Evelyn Harris when she led throughout to win a fifth grade by eight lengths in 29.79.

Fran's Bonus had been unplaced at her only previous Wentworth Park outing but has struck form at the right time and has now won five of her past six starts, with Saturday's win giving Harris a winning double.

She had taken out an earlier fifth grade with Bad Neighbour in 30.11.

Saturday night's eagerly anticipated Zoom Top Flying4 produced a minor upset result when the John Finn-trained Blue Moon Rising toppled his litter sister and kennelmate Poco Dorado.

Poco Dorado, the odds-on favourite, had been expected to make the pace and lead all the way, but she settled down in last place in the field of four, with her other siblings and kennelmates Two Times Twice and Veloce Nero leading at the first turn from Blue Moon Rising.

Blue Moon Rising accelerated into second spot on the back straight and after grabbing the lead on the home bend, held off a late rush from Poco Dorado to win by just over a length in a slick 42.16 for the 720m.

Owner Jimmy Vescos watched from a hospital bed on Saturday as his greyhound Princess Riot maintain her unbeaten record with a first-up Wentworth Park win in a smart 29.97 in a 520m fifth grade.

Princess Riot, who joined the Peter Lagogiane kennel six months ago, had previously won four provincial races over 388m and 400m.

"I set her for tonight's race because she is two months too old for the Peter Mosman heats,'' Lagogiane said on Saturday.

"Princess Riot had two looks at Wenty in trials before tonight and I was confident she would run out a solid 520 metres.''

Vescos, who has suffered two strokes in recent weeks, said: "I was in bed watching Princess Riot's race on TV while being given a needle in my stomach!''

Blabba Mouth, who has just turned five, notched his 10th Wentworth Park 520m win when he led throughout in a 520m Masters' race on Saturday.

Blabba Mouth bolted in by five lengths, covering the journey in 29.91, which compared well with his personal best figures of 29.77, posted last October.

"I think we forgot to tell him how old he is,'' Michael Murray, whose wife Cheryl owns and trains Blabba Mouth, quipped later.

"If you had seen this dog at home over the past couple of days you would want to have backed him, he was jumping up on people, rolling around the ground wagging his tail, and scratching in the grasss.

"He just looked so happy and fit so we knew he was going to win tonight.''