Gai Waterhouse is looking to have four Golden Slipper runners but her biggest concern is getting the favourite into the race.More Joyous is at $4.50 in markets on the world's richest race for two-year-olds but needs to win the Reisling Slipper Trial on Saturday to cement a spot in the 16-horse field.Second prizemoney would lift her earnings to $122,000 which may be enough to get in but may not be enough to convince punters she should still be favourite for the $3.5 million race at Rosehill on Ap

Gai Waterhouse is looking to have four Golden Slipper runners but her biggest concern is getting the favourite into the race.

More Joyous is at $4.50 in markets on the world's richest race for two-year-olds but needs to win the Reisling Slipper Trial on Saturday to cement a spot in the 16-horse field.

Second prizemoney would lift her earnings to $122,000 which may be enough to get in but may not be enough to convince punters she should still be favourite for the $3.5 million race at Rosehill on April 4.

The filly created headlines with a buck jumping display in the Silver Slipper and was sent back to the barrier trials.

With new jockey Darren Beadman in charge, More Joyous passed Friday's test with flying colours.

But just in case things go wrong again, the Waterhouse back-up team has been strengthened by Manhattan Rain's Skyline Stakes win and Horizons' third in the Sweet Embrace.

Midweek debut winner New Day Rising rounds off the Waterhouse quartet.

"It is an amazing thing that the Slipper favourite is not even in the field," Waterhouse said.

"Manhattan Rain is a lovely colt coming right at the right time but I think More Joyous has more brilliance.

"But she has got to win next Saturday."

Manhattan Rain's Slipper price was slashed from $21 to $12 after his Skyline win and although Horizons' eased from $16 to $35 after her third to Headway, Waterhouse said she was still among the main chances.

"There was nothing wrong with her run and I was very happy," she said.

"Horizons did all the work in front and I thought she went well."

New Day Rising, a winner at Canterbury on Wednesday, is an $81 chance in the Slipper and will try to qualify via the Pago Pago Stakes on March 28.

Melbourne filly Rostova is at $9 for the Slipper following her return to winning form in the VRC Sires' Produce Stakes.

She was not among the original Slipper nominations and her owners will have to pay $150,000 by March 30 to put her in the race.

Rostova is due to be transported to Sydney this week to be prepared for the race.