In 2016, Alpha Delphini was ridden in all of his races by Connor Beasley and began his campaign by carrying 130 pounds to victory in a minor handicap at Musselburgh Racecourse on 24 April.
[8] Two weeks later he followed up in a more valuable handicap at Ascot Racecourse, wearing down the long time leader Final Venture to gain the advantage in the last stride and win by a short head.
[10] He was then moved up in class again for the Group 3 World Trophy at Newbury Racecourse on 17 September and sustained a narrow defeat as he went down by a short head to the four-year-old Cotai Glory.
[11] The change of jockey brought about no immediate improvement as Alpha Delphini ran unplaced in the Nunthorpe Stakes and then came home seventh behind Take Cover when attempting to repeat his 2017 success in the Beverley Bullet.
On 25 September Alpha Delphini started 5/4 favourite for a minor race at Beverley and recorded his first win of the season as he took the lead inside the final furlong and held on to prevail by a neck from Line of Reason.
[12] In a similar race at Musselburgh in October Alpha Delphini ended his season with another victory as he took the lead approaching the last quarter mile and won by a length at odds of 6/5.
[13] Alpha Delphini began his 2018 season by finishing second to Kyllang Rock when favourite for a minor race at Musselburgh on 31 March and then ran a close third behind Mabs Cross and Judicial in the Palace House Stakes.
After tracking the leaders down the centre of the straight Alpha Delphini moved up to dispute the lead entering the final furlong with his main challenge coming from Mabs Cross who was racing up the stands side rail.
"[11] On his final run of the year, Alpha Delphini finished unplaced behind Mabs Cross in the Prix de l'Abbaye at Longchamp Racecourse in October.
"[15] The 2020 flat racing season in Britain was disrupted by the COVID-19 pandemic and Alpha Delphini did not make his comeback appearance until 18 July, when he finished eighth behind Moss Gill in the City Walls Stakes at York.