It came down to a two-horse race between Hannah Rajotte/ Patronus and Ashley Arnoldt/Lestat OLD over Peter Holmes' course at tbird.

A contentious eight-horse jump-off saw Vanessa Mannix (CAN) and Catinka 25 settle for second with Conor Swail (IRL) and Theo 160 third.

The newlywed won the $15,000 CSI3* Maui Jim Winning Round 1.45m aboard her longtime mount, Goodwill VB.

In the four-horse jump-off in the 1.50m CSI3* class on Thursday, the Irishman stacked the odds by making up 50 per cent of the lineup.

Vanessa Mannix (CAN) and Catinka 25, who won the $100,000 ATCO Cup last week, finished a very close second.

Morton wins the $15,000 CSI3* Kubota Canada class at the Summer Fort Classic, while Kassidy Keith takes the second of three U25 events.

After making the podium on three other occasions at the Summer Fort Classic, Mannix broke through with an impressive win.

Competition continues at the Summer Fort Classic CSI3* with Irish rider Robert Blanchette placing one-two in the $25,000 Hunter Derby.

As the border gradually reopens to non-citizens, it sees the welcome return of international competition to Thunderbird Show Park.

Due to an extension of the current pandemic restrictions, the venue is unable to host the Canadian Premier and Odlum Brown BC Open.