The 21-year-old Canadian, who rides up-and-coming horses for Attache Stables, kicked off the Summer Fort Classic at Tbird with a victory.
Summer Fort Classic
Matt Sampson shines in the CSI3* ATCO Cup Grand Prix; Tiffany Foster continues her winning ways at Thunderbird Show Park.
The Canadian rider and Face To Face have developed in leaps and bounds since competing in the 1.20m division last season.
After making the podium on three other occasions at the Summer Fort Classic, Mannix broke through with an impressive win.