Brown Sugar defied a 3lb penalty to land the totepool.com Sirenia Stakes at Kempton.
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The Molecomb Stakes winner finished fifth behind No Nay Never in the Prix Morny last time and had his sights lowered for this Group Three contest.
Pat Dobbs was aboard the 11/2 winner who hung away from the whip when asked to pass Bahamian Heights around the furlong marker.
Richard Hannon's charge was soon back on an even keel but Figure Of Speech (9/2) emerged as a serious rival inside the distance and the pair flashed past the post together.
The photograph confirmed Brown Sugar had held on by a short-head with the principals pulling four lengths clear of the trailblazing Simple Magic back in third.
Dobbs said: "He used to be very highly strung but he has settled down now. I got there a bit too soon but he's a good little horse."