Jezpark is bound for the $500,000 Karrakatta Plate (1200m) after a gutsy win in the $100,000 Supremacy Stakes (1100m) at Ascot.
A beaten favourite at his past two starts, Jezpark ($9) was sent to the lead by jockey Jarrad Noske and was suited in hot conditions favouring leaders.
Noske kicked the Bletchley Park colt clear at the top of the straight, with Big Caroline ($8) the only danger.
Big Caroline closed late but her late dive missed, as Jezpark held on to score by a half head.
Hobart Jones, a top Karrakatta prospect after winning his first two starts, made an impressive return.
He ran on from well back to finish third.
Race favourite Femmette ran fifth and Ken's Astar was fourth.
Trainer Ted Martinovich had no concerns about Jezpark backing up a week after running third to Django as the $2.40 favourite.
"He's a bit of a gross colt and that's why I buttered him up," Martinovich said.
"He's been wobbling around the bends and I thought he should go forward.
"I knew a couple of the fancies would have to make up ground so I thought we could get a break on them.
"Hell go to the Perth Stakes in two weeks then two weeks to the Karrakatta."