Australian Zac Purton has extended his lead over Joao Moreira in the Hong Kong Jockeys' premiership.

Purton started Sunday's Sha Tin meeting with a three-win advantage over Moreira and ended the 11-race card with one winner on the day while the Brazilian went winless.

It means Purton holds a four-win lead - 127 to 123 - with 12 meetings of the season remaining.

Purton is aiming for his third straight Hong Kong premiership and fourth overall while Moreira is also striving for his fourth title.

While Purton and Moreira managed one win between them on Sunday, Chad Schofield was one of three riders to snare winning doubles.

One of Schofield's victories came in the feature on the program, the Group Three Lion Rock Trophy Handicap (1600m) aboard Ka Ying Star.

The double took Schofield to 39 wins for the season, a new personal best for him in Hong Kong.

The next Hong Kong meeting is at Happy Valley on Wednesday night.