Aug. 2: The O’s formally announced Mayo’s promotion. Infielder Livan Soto was optioned to Norfolk to open a spot on the active roster. Baltimore’s 40-man roster is now at capacity.
Aug. 1: Top prospect Coby Mayo is joining the Orioles, reports Roch Kubatko of MASNsports.com (X link). The 22-year-old will be making his MLB debut. Mayo is not yet on the 40-man roster but the O’s have an opening, so they’ll only need to make a corresponding active roster transaction.
Baltimore took Mayo out of high school in the fourth round of the truncated 2020 draft. He signed for an above slot $1.75MM bonus and has ripped through minor league pitching at every level. The 6’5″, 230-pound corner infielder had pushed his way towards the top of a loaded O’s system by the start of the 2022 campaign. He had good but not elite numbers as a 20-year-old between High-A and Double-A that season.
A monster showing in the upper minors last year vaulted Mayo to the top of the overall league prospect rankings. He hit .307/.424/.603 with 17 homers in 78 games for Double-A Bowie. The O’s bumped him to Triple-A Norfolk late last season. Mayo responded with an excellent .267/.393/.512 slash across 62 contests.
Mayo entered the year as a top 30 minor league talent in the eyes of most evaluators. He has done all he can to reinforce that acclaim with another excellent year in Norfolk. Mayo has popped 20 homers over 335 plate appearances. He’s hitting .294/.370/.581 with a strong 10.1% walk rate. While his 24.5% strikeout percentage is a bit higher than average, it’s not a major concern for one of the best power-hitting prospects in the league.
The righty-hitting Mayo is tied for fourth in the International League in home runs. Among 83 hitters with 300+ plate appearances, he leads the league in slugging percentage. Mayo is 10th among that group in average and 25th in on-base percentage despite being one of the league’s youngest hitters.
Mayo ranks as the sport’s #12 prospect at Baseball America and FanGraphs. Keith Law of the Athletic ranked Mayo 18th on his recent update of the sport’s top 60 prospects. All three outlets have him as either the #2 or #3 player in the Baltimore system. He’s behind Jackson Holliday and alongside catcher Samuel Basallo at the top of an organization that is still loaded with high-end young talent.
BA and FanGraphs each credit Mayo with 70-grade power (plus-plus) on the 20-80 scouting scale. FanGraphs writes that Mayo could be susceptible to strikeouts early in his MLB career, but evaluators generally feel he shouldn’t have any problem getting to his impact power while drawing plenty of walks.
Mayo’s defense is more of a question. He has played exclusively on the corner infield in his minor league career. The vast majority of that experience has come at third base. Most scouting reports peg him as a fringe-average defender there despite excellent arm strength. FanGraphs’ report suggests Mayo may be best suited moving off the position to right field, but the O’s have not given him any outfield work in the minors.
He’ll break into the majors as a third baseman. Baltimore lost Jordan Westburg to a broken hand yesterday. The O’s have yet to provide a clear timeline on the All-Star’s return, yet he’s certainly in for a lengthy absence. Baltimore played Ramón Urías at the hot corner today. With Urías hitting a league average .244/.318/.381 in 195 plate appearances, they’ll turn to Mayo in the hope that the youngster provides above-average offense right out of the gate.
That’s no guarantee for any prospect, as Holliday’s struggles after his first big league call demonstrated early in the season. Yet there’s nothing more for Mayo to prove in the minors, as he now owns a .283/.380/.552 slash with 36 doubles and 32 homers in 602 career Triple-A plate appearances (the equivalent of one full season). Mayo would probably have gotten a look by now if he were in most other organizations. The O’s have such an impressive collection of infielders that they could afford to wait for him to comprehensively dominate minor league pitching.
Baltimore fans can dream on a future infield comprising Mayo, Holliday, Gunnar Henderson and Westburg from right to left. For now, Mayo will stick at the hot corner with Ryan Mountcastle and Ryan O’Hearn continuing to share first base and designated hitter. Urías should kick into a utility role which could bump recent trade pickup Livan Soto to Norfolk.
Barring a herculean start to his MLB career that earns him a top two finish in Rookie of the Year balloting, Mayo will not get a full service year this season. The O’s control him through at least the 2030 campaign; he won’t reach arbitration until the 2027-28 offseason. If Baltimore options him back to the minors at any point, that could delay his path to arbitration and free agency.
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