OSTRAKA sprang a 66/1 shock in the featured William Hill Top Price Guarantee Mercury Stakes at Dundalk to give apprentice title contender James Ryan his first group winner.

The Profitable filly broke smartly in the Group 3 contest over five furlongs before taking a lead. In front passing the furlong pole, the 83-rated performer stuck on gamely when asked for an effort in the closing stages and held the late charge of Powerful Nation to record a head victory. Electric Storm fared best of the five British-trained runners in third.