Beaten 28 lengths when last seen in the $20-million Saudi Cup Feb. 29, McKinzie is two-for-two at this seven-furlong distance, including a win in Santa Anita's GI Malibu S. in 2018.
The 2019 GI Whitney S. hero was second-best in several high-profile races term, led by the GI Breeders' Cup Classic, GI Runhappy Metropolitan H. and GI Santa Anita H.
McKinzie, trained by Hall of Famer Bob Baffert, is the 3-5 morning-line favorite.
The rail-drawn Flagstaff (Speightstown), a respectable third behind Omaha Beach (War Front) in the GI Santa Anita Sprint Championship S. last fall, followed a win in the GII San Carlos S. over track and trip Mar. 7 with a big second after a slow start in Oaklawn's GIII Count Fleet Sprint H. Apr. 18.