[7] She entered the green and white colours of Scottish businessman John Breslin and was sent into training with Mick Channon at West Ilsley in Berkshire.
Ridden as on her debut by Richard Quinn she accelerated away from her thirteen rivals in the final furlong and won by two and a half lengths from Blue Velvet.
Twenty days later, Quinn was back in the saddle when Seazun was one of fourteen fillies to contest the Group One Cheveley Park Stakes at Newmarket.
Seazun raced down the centre of the wide Newmarket straight as Torgau set the pace, before moving up to challenge approaching the final furlong.
[12] On her three-year-old debut Seazun was partnered by Frankie Dettori when she contested the Nell Gwyn Stakes (a trial race for the 1000 Guineas) over seven furlongs at Newmarket.
[15] After a two-month break, Seazun returned in the Celebration Mile at Goodwood Racecourse in which she was matched against colts and older horses.
On her final racecourse appearance, the filly finished seventh behind Danceabout in the Sun Chariot Stakes at Newmarket on 30 September, Seazun was retired from racing to become a broodmare in Japan.