Mernagh was riding Paronomasia, in the two-mile one-furlong race. Dashing the horse out of the stalls, Mernagh had him clear before easing down the 33-1 shot as he passed the line. Mernagh tried to get back into the race but the six-year-old trailed in last of 15 runners.
Jimmy Harris, Paronomasia's trainer, said: "He told me he got the race mixed up with the one before and thought it was a sprint race."
Mernagh was suspended for seven days for mistaking the distance of the race, the minimum the stewards could impose for an apprentice.Reuse content