Damien Oliver is one of only seven jockeys to have captured the four big races of the Australian calendar.
His bag includes two Cox Plates, three Melbourne Cups and four Caulfield Cups.
Success aboard Seabrook in today's A$3.5 million Golden Slipper Stakes at Rosehill would give him a second victory after Forensics won in 2007 and make him the first rider to win a double grand slam.
Oliver was shattered Seabrook didn't make the final cut for last month's Blue Diamond Stakes but believes the filly can make up for that disappointment on Saturday.
Seabrook sits on the third line of betting for the Golden Slipper at $8.50 behind Sunline ($4.20) and Written By ($5).