Siyaadah is 50-1 Dubai winner
The daughter of Shamardal was sent off an unconsidered 50-1 chance having been off the track since last October, and appeared to have plenty to do turning for home.
Hot favourite Raihana was nudged to the front at the top of the straight but could not sustain her run and Ahmed Ajtebi galvanised Siyaadah to get up in the shadow of the post for a shock success. Ayun Tara filled the runner-up spot, while Berg Bahn was third for Irish trainer Ger Lyons.
Ajtebi said: "To be honest it's not a big surprise as she was working like a machine at home. We were drawn wide but everything went right for me in the straight and she just took off.
"I was last turning for home and when she started to go I thought I might be placed, but she just didn't stop."
Newmarket trainer James Eustace bagged a big winner as War Artist (7-2) streaked away with the Group Three Al Shindagha Sprint in the hands of Olivier Peslier.
High-class in Europe throughout last season, the seven-year-old was putting a below-par effort in the Hong Kong Sprint well behind him – and judged on this effort it is going to take a fair animal to beat him in the near future.
Eustace said: "I'm delighted because I thought he would need it. He did it nicely and I'm delighted he put Hong Kong behind him because that wasn't him for whatever reason.
"His best form is six furlongs in a straight line on fast turf and hopefully he'll get that here in the Al Quoz Sprint next month. That's his only entry."
Meanwhile, today's meeting at Ayr has been abandoned due to a frozen track. Officials at the Scottish track announced a midday inspection to determine the prospects of racing after overnight temperatures dipped to around -5C.
Clerk of the course Hazel Peplinski admitted prospects were bleak and was left with no option but to call off proceedings, with conditions showing no signs of improvement. Peplinski said: "We've got up to 2C but we still aren't raceable and are forecast another hard frost tonight, so unfortunately we've got no chance of racing tomorrow."
Ayr are also scheduled to be in action tomorrow. but the course faces a 3.30pm inspection today.