Jamie Kah, the 25-year-old jockey who makes no apologies for shunning the limelight, is the toast of Australian racing after setting a Melbourne riding record.

Kah became the first jockey to ride 100 city winners in a Melbourne season of racing at Caulfield on Saturday.

Stranded on 99-1/2 winners after missing out midweek, Kah landed the milestone when Deep Speed held on over 1100m.

The history-making moment came in front of a better-than-average crowd for a winter meeting as Kah told of her relief in breaking Brett Prebble's 21-year-old record.

"It's been a very, very long week," Kah told Racing.com.

"I've had some really good people around me getting me through it.

"I thought I had a good book of rides today and it was going to be a pretty bad day if I didn't get it."

After finishing unplaced on Viviane in the opening race, Kah took luck out of the equation in the next as Deep Speed made the running.

The well-supported favourite established a clear-cut lead at the 200m but shortened stride before clinging on for a narrow win.

"I was hearing the crowd and getting goosebumps over the line," Kah said.

"I'm not the one for crowds and people cheering my name, it's very foreign to me still."

Kah took Adelaide racing by storm before moving to Melbourne in early 2019 and landed her first Group One win a few months later when Harlem took out the Australian Cup.

She has notched a further five Group One victories.

As the 2020-21 Australian racing season draws to a close, Kah has an unassailable lead in the Melbourne jockeys' premiership and is already an odds-on favourite to win again next year.

She leads her nearest rival Damian Lane by almost 40 wins after adding to Caulfield tally when Red Santa survived a protest.

"To achieve what she's done, she is really one of the great sportswomen in the country," Deep Speed's trainer Tony McEvoy said.