Limestone got up in the shadow of the post to pip Godolphin’s Del Maro, giving Classic-winning jockey Dylan Browne McMonagle a second Royal Ascot winner.
With a furlong to go in the one-mile-six-furlong contest it looked as though 40-1 outsider Ranga Tang was going to hold on to deliver another shock result at the Royal meeting.
But McGonagle, who won the Oaks with Thundering On at Epsom, got a rousing finish out of the Joseph O’Brien-trained three-year-old to pip Del Maro on the line.
The 10-3 shot beat the Godolphin horse by a nose with pacesetter Ranga Tang hanging on for third.