Glass Office springs Duke Of York surprise Glass Office came with a well-timed late run to get the better of a tight finish and claim a surprise victory in the Duke of York Clipper Logistics Stakes on the Knavesmire. The keen-going Muthmir quickly hit the front in the hands of Paul Hanagan and was soon tracked by confirmed front-runner Astaire and French raider Gammarth. Despite racing with the choke out, the William Haggas-trained Muthmir maintained his position until being passed late in the day by Astaire, Caspar Netscher and Mattmu. David Simcock's Glass Office looked to have plenty to do approaching the two-furlong pole, with more horses in front of him rather than behind. However, the 40-1 shot found an extra gear for Jim Crowley to foil Mattmu, the sole three-year-old runner in Group Two six-furlong event, by a head. Crowley said: "I got shuffled back early on and we just had to work our way into it. "To be honest, he had been off the track for such a long time before Newmarket we were hoping he would improve. "David Simcock has done a fantastic job to get him back after such a long lay-off. It was a great performance." Gathering Power was the sole Irish representative and she finished a respectable eighth under Kieran Fallon for Eddie Lynam.