Marcelo Mayer

Bats Left, Throws Right
Height 6' 3", Weight 188 lb.
High School Eastlake High School (Chula Vista)
Debut May 24, 2025

Born December 12, 2002 in Chula Vista, CA USA

Biographical Information[edit]

Shortstop Marcelo Mayer was the top-ranked player heading into the 2021 Amateur Draft. He was selected 4th overall by the Boston Red Sox, out of a high school in California. He was the Sox's most coveted player from the start, and even though their drafting rank was their highest since the 1967 amateur draft, they were almost certain that he would no longer be available by the time they drafted. Both the Pittsburgh Pirates, who had the first pick, and the Detroit Tigers, were said to be very interested in him, and the Texas Rangers, who drafted second, were looking at him as a back-up option if the Pirates happened to select their preferred player, P Jack Leiter, first overall. However, things fell into place for Boston when Pittsburgh opted instead for C Henry Davis while Detroit took high school P Jackson Jobe after the Rangers did nab Leiter. He signed with Boston for a bonus of $6.66 million, an amount which set a franchise record.

Mayer was described as a five-tool prospect before the draft and often compared to players like Corey Seager, Brandon Crawford, Chipper Jones and Carlos Correa. There was some concern that at 6' 3", he could be too big to be a long-term shortstop, although his defense was rated as excellent and his bat was strong enough for him to handle almost any other position if a switch was necessary, as he batted .392 with 14 homers and 45 RBIs as a high school senior. When MLB updated its top 100 prospects list for the first time after the draft, in mid-August, he was the highest ranked player from 2021 to appear on it, at #8. This was based purely on potential, as he had barely started his playing career at that point, with just 5 games with the FCL Red Sox. In his first pro season, he hit .275/.377/.440 in 26 games in the Florida Complex League. In 2022, he started the season with the Salem Red Sox of the Carolina League before moving on to the Greenville Drive of the South Atlantic League after 66 games. Overall, he appeared in 91 games and hit .280/.399/.489, with 30 doubles, 13 homers, 61 runs and 53 RBIs.

He was named to the American League team for the 2023 Futures Game. That season, he played 78 games between Greenville and the Portland Sea Dogs of the AA Eastern League. There was a big difference between his performance at the two levels: he hit .290 in 35 games in Class A, and .189 in 43 games at the higher level. Overall, his slash line was .236/.306/.433 with 13 homers and 54 RBIs. He had a much better season for Portland in 2024, playing 77 games and batting .307/.370/.480, with 8 homers and 38 RBIs. He was once again a Futures Game selection that year, and was named to the Eastern League post-season All-Star team. Had his season not been ended by an injury, as it had the previous season, he would likely have made his major league debut that year.

He went to spring training as a non-roster invitee of the Red Sox in 2025. It was at second base that the Red Sox had an opening, with Trevor Story finally healthy again and expected to start at shortstop, and he was in competition with David Hamilton and Vaughn Grissom, who already had major league experience, and another top prospect in Kristian Campbell. It did not look at first as though he had much of a shot, and he saw most of his game action at shortstop and third base in the early going, but after hitting .355 in his first 16 spring games, he was very much in the running for the starting job. Still, it was Campbell who got the coveted job in Boston, while he headed to the AAA Worcester Red Sox to start the season. After 43 games, he was hitting .271 with 9 homers and 43 RBIs, and it was only a matter of time until he was called up to make his major league debut. That call came on May 24th, between games of a doubleheader against the Durham Bulls, when he was summoned to Boston after 3B Alex Bregman was placed on the injured list with a strained right quad. One problem was that he had lost his car keys a couple of weeks before, and that it was still sitting idle in Polar Park's parking lot while he was trying to address the problem; he had to ask a clubhouse attendant to drive him to Fenway Park. He made it in time for the second game of the Red Sox's own doubleheader, against the Baltimore Orioles and started at third base, going 0 for 4 with three strikeouts in a 2-1 loss. He recorded his first two major league hits the next day. He hit .228 in 24 games, with 4 homers and 10 RBIs, before going on the injured list on July 25th with a right wrist sprain. The injury turned out to be more serious than initially thought, as on August 17th Mayer announced that he would undergo season-ending wrist surgery.

Given his rookie season had ended early, there was as much uncertainty for him heading into spring training in 2026 as there had been the year before, with his being in direct competition for the second base job with Campbell. Third base was no longer an option, as the Sox had acquired Caleb Durbin from the Milwaukee Brewers to fill the position, following Bregman's departure via free agency. Mayer won the job outright in spring training with Campbell being sent back to the minors. The two had put up equivalent numbers in the majors the previous season, and in spring training as well, but Campbell had failed to hit much after a strong first month in the majors, spending the second half of the year in AAA, and Mayer was considered the better defender at second in any case.

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Marcelo Mayer

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