Sheikh Ahmed's daughter of Shamardal was given a good ride by Freddie Tylicki, who settled her in the midfield.
She travelled well and went in pursuit of the leader Joys Of Spring with two furlongs to run.
The pair engaged in battle but Rekdhat soon got the better of that rival and forged on to win by a length.
Roger said: "Rekdhat is a progressive filly. The extra furlong has suited her and she has to have fast ground. When she gets her conditions, she is a useful filly."