Aidan O'Brien had been so impressed with his work at home and also on the racetrack, that he joked once, "I think I'll move him in beside me and knock a door in the bedroom to put him up for the winter!"
[citation needed] For his performance in the 2003 racing season One Cool Cat was named Cartier Champion Two-year-old Colt.
A return to 6 furlongs was a victorious one, beating The Kiddykid by a length in the Group 3 Phoenix Sprint Stakes, again at the Curragh, at the start of August.
Just eleven days later, he started as favourite for the Group 1 Nunthorpe Stakes at York Racecourse, finishing 3rd, although may well have won with a better run.
The Group 1 Haydock Sprint Cup was next on the agenda 2 weeks later, but the 3rd run in such quick succession was seemingly too much for him, and finished 6th, 3 lengths behind the winner Tante Rose.