The win marked Brash’s third grand prix victory of the H.H. Father Amir’s Prix series at Al Shaqab in Doha, Qatar.
The culmination of the 'Masters' 50th anniversary saw the British rider pilot Hello Jefferson to a nail-biting win in the $5 million event.
The victory came aboard Hello Jefferson in a starting field of 37, edging Germany's Daniel Deusser and Killer Queen VDM.
The grand finale of the CSI5* was the perfect tune-up prior to the Olympics for Brash (GBR) against a tough international field.