It was a day of breakthrough wins for apprentices at Mornington on Monday.

The metropolitan meeting at the provincial racetrack was one both Kayla Nisbet and Brodie Loy will never forget as they brought up their first city wins.

Fellow apprentice Ryan Hurdle also broke through for his first metropolitan success in Melbourne but was later fined $300 for not being able to claim his full allowance in a race.

Nisbet is on a three-month loan to Hall of Fame trainer David Hayes and is hoping that will be extended after guiding Poitier to a three-quarter length win in the Showtime Attractions Handicap (1200m).

Hayes said if Nisbet was happy with the set-up then her time as an apprentice at Lindsay Park might be extended.

"She has been peppering the goals so it was nice to see her get her first city winner," Hayes said.

Nisbet, daughter of Canberra-based trainer John Nisbet, said it was a relief to get her first city winner after a few recent placings.

Loy, 16, claimed his first city success on the Steve Richards-trained Capodichino.

"It's a big thrill," Loy said.

"It's only my second city ride and I've only been riding for eight months."

Loy is from Albury and said he was looking to make his loan stint with Richards permanent in "a month or so".

Hurdle, a New Zealand apprentice and formerly based in Queensland, has been in Victoria for two and a half months and his win on Faith 'n' Belief in the Hyland Race Colours Plate also came as a relief.

"I thought I would come to Melbourne and have a crack while I've still got a bit of a claim left," Hurdle said.

"It's just a shame it wasn't on one of the city tracks. But I'll still take it."

The apprentice had his day soured with a fine because he couldn't claim his full allowance on Rustana who was only beaten a short head in the final race.