A question on Easy Goer...

Originally Posted by philcski

I got one (inside info). Do i get half a prize?

I'll toss you an easy one.
In 1992 on a summer's morning in Saratoga Shug had a turf stakes horse he needed to work out. He wanted the horse to get something out of the workout and needed a workmate.
He really didn't have another grass horse he thought could keep up with this horse so he decided to work out a dirt horse who had soured and who he really didn't have any idea what to do with.
So the horses broke off and at the top of the lane the soured dirt horse disposed of the grass stakes horse, and outworked him by a pole, causing McGaughey to yell Holy ****!!! and smash his binoculars to pieces in jubilation.
Who was this horse?