Marcelo Mayer - Fantasy Baseball Prospects Waiver Wire Pickups (Week 9)

Marcelo Mayer is a fantasy baseball waiver wire pickup for Week 9 (2025). Target Marcelo Mayer as a top prospect free-agent add for fantasy baseball.

BALLER MOVE: Add in All Leagues

ROSTERED IN: 25% of Leagues

ANALYSIS: The Boston Red Sox promoted top infield prospect Marcelo Mayer to the major leagues on Saturday. Mayer is considered Boston's No. 2 prospect and No. 8-best on MLB Pipeline. The Red Sox did us a solid this week by promoting Mayer on Saturday afternoon, sparing us the angst stemming from stashing a highly rated prospect.

The move was brought about by the injury to Alex Bregman (quadriceps), leaving a hole at third base.

Mayer was given the start at third in Boston’s second game against Baltimore in their Saturday doubleheader, though it was not the storybook beginning to an MLB career. The 22-year-old went 0-for-4 at the plate with three strikeouts and two runners left on base, but he can be expected to recover from the inauspicious start.

Marcelo Mayer is being called up!

Triple-A: 193 PA, .271/.347/.471, 9 HR, 10.4% BB, 19.7% K
47.8% HH, 9.7% BRL, 84.5% Z-Con

Worth a look in all 10+ team leagues. pic.twitter.com/8sY0DERki8

— Eric Cross (@EricCrossMLB) May 24, 2025

In 43 games at Triple-A this season, Mayer already had nine home runs, 31 runs, and 43 RBI with a solid .271 batting average. Whether the Red Sox stick with him at third or play him at second over a slumping Kristian Campbell, Mayer should see regular work during Bregman’s absence.

The rookie will have the added comfort of continuing his debut in familiar territory, with Boston playing out a six-game homestand in Week 9.

- Written by Dan Stephens

Top Prospect Rankings and 2025 Call-Up ETAs

You can also check out RotoBaller's fantasy baseball prospect rankings for 2025. Eric Cross updates the below rankings weekly for the top impact prospects for 2025, and when they may be called up:

Top Prospect Dynasty Rankings

Looking for longer term fantasy baseball prospect rankings? You can also check out RotoBaller's top dynasty prospect rankings from Eric Cross:

Popular Player Comparison Searches - Who To Pickup?

Below are some popular searches and comparisons from our fantasy baseball Who To Pickup tool for Marcelo Mayer and others. You can also use the free Who Should I Pickup tool to run your own waiver wire comparisons, up to four players at once:

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