Mighty Heart is from the first crop of foals sired by Dramedy, a well bred son of Distorted Humor whose biggest win came in the Elkhorn Stakes on turf.
He made his first start as a three-year-old on February 21, 2020 in a maiden special weight at Fair Grounds in Louisiana in a race that was originally scheduled for the turf but was switched to dirt.
[9][10] He returned to racing on July 11 in a maiden special weight over 1+1⁄16 miles on Woodbine's all weather main track.
He settled in stalking position just off the pace set by Fort Hope and Artie My Boy, then took the lead in midstretch.
He sat fairly close to the early leaders and made a wide move on the final turn to hit the lead in mid stretch.
[12] On September 12, Mighty Heart faced a sharp increase in class when he was entered in the Queen's Plate, Canada's most famous horse race and the first leg of the Canadian Triple Crown.
He was ridden for the first time by Daisuke Fukumoto, who decided to send Mighty Heart to the early lead since nobody else was eager to set the pace.
Clayton closed to within a head on the turn but Mighty Heart responded and pulled away down the stretch to win by 7+1⁄2 lengths.
Mighty Heart's time of 2:01.98 for 1+1⁄4 miles was the second fastest in the history of the race, behind only Triple Crown champion Izvestia, who finished in 2:014⁄5.
"[14] Mighty Heart's next start was on September 29 in the Prince of Wales Stakes, the second leg of the Canadian Triple Crown, held at Fort Erie Racetrack over a natural dirt surface.
"[16] Mighty Heart started in the Breeders' Stakes on October 24, run over 1+1⁄2 miles on Woodbine's turf course (officially labeled as good after rains earlier in the week).
[19] At the Sovereign Awards for 2020, Mighty Heart was named the Canadian Horse of the Year and Champion three-year-old colt.
He bumped with Sprawl at the start but regained his stride and tracked the early pace set by American Dubai, led until midstretch.
Mighty Heart then dueled to the finish line in a three-way battle with Night Ops and Sprawl, winning by a nose.