Ocean Park has continued an unbeaten spring build-up to the Cox Plate with a hard-fought win in the Caulfield Stakes.

The New Zealand star, a short-priced favourite, had to call on all his reserves to beat Alcopop and the Sydney galloper Sincero.

"It was the race he needed to have today ... he's actually put on weight since that last run (in the Underwood Stakes)," winning jockey Glen Boss said.

Ocean Park sat fourth and was eased out three-wide at the 500m to set out after the leaders Midas Touch and Sabrage.

He joined in as the field straightened with Sincero peeling off his back to make a bid.

Sincero loomed large until he peaked on his run, leaving the veteran Alcopop to take the second placing.

A four-year-old, Ocean Park is undefeated in three runs since his return to racing early last month.