Glenys The Menace, named after one of her three owners' mothers, took the Dubai Duty Free Shergar Cup Classic at odds of 8/1 for trainer John Best and reigning South African champion jockey Anthony Delpech.
The three-year-old American Post filly beat Contango by half a length.
Glenys The Menace under Anthony Delpech gets her nose in front, photo Liesl King
"She's tough," said Best. "Last year we thought she was pretty decent and she won us three races, but she was always going to be a better three-year-old; she's so much bigger now. Earlier on this year we thought she was going to be Listed class or thereabouts, and she's not far off now.
"She's been out in the field for two days since she ran at Sandown, but that's a brave effort, to come from soft ground at Sandown on Thursday [where she finished second, beaten half a length].
"I said to the jockey that we were drawn a little bit wide, she'd be better with the cover that she didn't get last time - that was no fault of Kieran Fox's because there were only four runners - get her switched off and that she'd come good at the latter stages of the race. My concern was that the race might come a little bit too soon, but he [Delpech] did everything we asked.
"She's named after Mark Curtis's mother."
Delpech returns on Glenys The Menace, photo Liesl King
Anthony Delpech, who was on board 8/1 winner Glenys The Menace, said: "I said earlier I was getting closer and closer!
"The trainer (John Best) was quite bullish about the horse's chances, the race worked out lovely.
"I was happy where I was and a couple of strokes and Glenys The Menace picked up nicely.
"I came with a good run and was getting there, getting there all the way to the line.
"I just wanted to have one winner today and I have done it. I am so thankful and it is a privilege to be riding here.
"They say my best ride is in the last race so let's hope they are right."
Kerrin McEvoy, who rode second placed 2/1 favourite Contango, said: "He ran a great race, Andrew (Balding) has a good opinion of him and the horse is only lightly raced and he gave a good account of himself there."
3.25pm £45,000 Dubai Duty Free Shergar Cup Classic 1m 4f
For 3yo, rated 76-95 (also open to such horses rated 96 and 97; such horses rated 75 and below are also eligible). Lowest weight 8st 9lb; highest weight 10st/ Penalties, after August 5, 2017, for each race won 3lb.
1) GLENYS THE MENACE (FR) 3-9-01 John Best  Anthony Delpech ROW 8/1 15 POINTS
2) CONTANGO (IRE) 3-9-11 Andrew Balding  Kerrin McEvoy ROW 2/1 Fav 10 POINTS
3) BEAR VALLEY (IRE) 3-9-07 Mark Johnston  Fran Berry GBI 9/1 7 POINTS
4) RAKE'S PROGRESS 3-9-00 Heather Main  Neil Callan GBI 7/1 5 POINTS
5) APPOINTED 3-9-11 Tim Easterby  Alexander Pietsch EUR 3 POINTS
6) KASPERENKO 3-10-00 David Lanigan  Adrie De Vries EUR
7) MISTER BLUE SKY (IRE) 3-8-09 Sylvester Kirk  Hollie Doyle (3) GIRLS
8) HOLD SWAY (IRE) 3-9-06 Charlie Appleby  Hayley Turner GIRLS
9) ITALIAN HEIRESS 3-9-00 Clive Cox  Keita Tosaki ROW
10) REACHFORTHESTARS (IRE) 3-9-10 David O'Meara  Umberto Rispoli EUR
Time: 2m 36.76s
Distances: ½, nk, 2¼, 2¼, sh, 2, 2¼, ½, 13
Breeder: Haras D'Etreham & George Lugon
Breeding: b f American Post - Elle s'Voyait DeJa (USA) (Carsonity (USA))
Tote Win: £9.10 Places: £2.70 £1.30 £2.70 Exacta: £29.90