[4][5] Yesterday's dam Jude showed little ability as a racehorse, failing to win in four starts[6] before being sold to Premier Bloodstock for 92,000 guineas as a three-year-old.
Jude's dam Alruccaba was an influential broodmare whose other descendants have included Alborada, Allegretto (Prix Royal Oak), Aussie Rules (Poule d'Essai des Poulains) and Albanova (Preis von Europa).
[3][7] Yesterday began her racing career in the Listed Fillies' Sprint Stakes at Naas Racecourse on 3 June in which she finished eighth of the eleven runners behind the British challenger Rag Top.
On her final appearance of the year Yesterday was matched against male opposition in the Listed Eyrefield Stakes over nine furlongs on heavy ground at Leopardstown Racecourse on 10 November.
[10] Yesterday began her second season in the 1000 Guineas over the Rowley Mile at Newmarket on 4 May in which she started a 20/1 outsider and finished eighth of the nineteen runners as Russian Rhythm won from Six Perfections, Intercontinental and Soviet Song.
Three weeks later at the Curragh Yesterday was one of eight fillies to contest the Irish 1000 Guineas and started the 11/2 second choice in the betting behind Six Perfections who was made the odds-on favourite.
After being restrained in the early stages she attempted to move into contention in the straight but was repeatedly blocked and hampered before obtaining a clear run inside the final furlong.
Ridden by Jamie Spencer she turned into the straight in fifth place and stayed on well but failed by a head to overhaul the Godolphin filly Mezzo Soprano.
Yesterday was then sent to America for the Breeders' Cup Filly and Mare Turf at Santa Anita Park on 25 October in which she stayed on from the rear of the field to finish third behind Islington and L'Ancresse.
She ended her racing career with a second attempt at the Breeders Cup Filly & Mare Turf at Lone Star Park on 30 October and finished fifth behind Ouija Board in a twelve-runner field.