[5] In the spring of 1990, Dayjur was aimed at the 2000 Guineas, but ran disappointing in his trial race, finishing seventh of the ten runners in the European Free Handicap over seven furlongs at Newmarket.
He was moved back down to six furlongs and won a minor race at Nottingham[7] before being beaten a head by Tod in a similar event at Newbury.
Ten days after his disappointing run at Newbury, Dayjur contested his first Group Race when he was pitted against more experienced sprinters in the five furlong Temple Stakes at Sandown Park Racecourse.
Once again, Carson allowed him to lead from the start and Dayjur pulled away in the closing stages to win by four lengths in a course record time of 56.16.
[11] In September, Dayjur was moved back up to six furlongs for the Ladbroke Sprint Cup at Haydock Park.
Dayjur led from the start, went clear inside the final quarter mile and held off Royal Academy to win by one and a half lengths.
On his final European start, Dayjur contested the Prix de l'Abbaye at Longchamp Racecourse in Paris.
During his final race, the 1990 Breeders' Cup Sprint at Belmont Park, Dayjur overcame a difficult wide draw to contest the lead with Safely Kept.