The son of Kimberly Milleson, a former Kansas State track star and U.S. Olympic trials participant, Heath racked up 75 steals in three years at Northwestern State. That included a 35-steal campaign as a junior in 2016, when the Royals took him in the 16th round. He has continued to wreak havoc on the bases as a pro, swiping at least 35 bags in three of his first four seasons. He led the Minors with 60 steals in 2019 while batting .255/.345/.387 between Double- and Triple-A. Fearing that he would be selected in the Rule 5 Draft, the Royals added the speedy outfielder to their 40-man roster in November.
Heath boasts an elite combination of athleticism and speed. The latter is least a 70 on the 20-80 scouting scale, and it enables him to impact games on both sides of the ball. Beyond the perennially high stolen base totals, Heath is an efficient basestealer who has been successful on 80 percent (160 of 200) of his attempts. He’s a natural in center field, with long, graceful strides that gives him range for days, and throws well enough to play all three outfield spots.
At the plate, Heath’s approach is geared toward making contact with a handsy swing and letting his speed do the rest. As a result, his batting averages have been propped up by a high average on balls in play at every stage of his career. That trend as well as Heath’s penchant for whiffing prompt questions about how the left-handed hitter’s bat will translate in the big leagues. Club officials point to Heath’s makeup and steady improvement as pro as reasons to believe he will make it all work, though, even then, it’s unlikely he’ll be anything more than a fourth or fifth outfielder.