Father overcame son as Aidan O'Brien's San Antonio beat Donnacha O’Brien-trained Alder at Chester this afternoon.
Victory at Dundalk saw Alder go off at 16/5, while San Antonio was priced as favourite at 11/10 as a result of impressive early season form.
Jockey Ryan Moore had San Antonio in the perfect position coming near the end of the race, leaving his rivals jostling for position in a messy contest.