Amed Rosario's wheels start to roll. Also: Brandon Lowe's struggles, another new relief ace in Tampa, and a look at two conundrums in Boston.

Buster's Back! Castellanos follows up, Aguilar bounces back, and a pair of Brewers hurlers break out.

Can John Means keep it up? Plus, evaluating Martinez's rebound, Gurriel's slump, and possible breakouts from Berrios and Rodon.

Yordan Alvarez already showed us his skills. Don't forget! Plus: What kind of power should we expect from Tim Anderson and Yuli Gurriel, and can John Means and Griffin Canning back up their solid 2020 results?

How much can we learn from a tiny batted ball sample? The results may surprise you.

Can Austin Meadows recapture the 2019 magic? Plus two LHP—Rich Hill, Steven Matz—and two SS—Elvin Andrus, Marcus Semien—going to new teams.

A primer on the logic and approach behind our conversion from per-9 to % of batters faced in pitching metrics.

MLB plans to reduce HR output by altering the baseball. Which hitters stand to be hurt more and less?

Luis Robert had an uneven season in 2020; what comes next? Plus getting under the hood of Bundy, Manaea, Mullins and Santander.

Can Polanco bounce back from an off year? What happened to Arraez elite batting average potential? Also, a look at Willy Adames' new approach, an two relievers whose performances belie their skills.

Does José Berríos have another gear? Also: Brad Hand's downside, Jose Iglesias' interesting plate skills, Yoan Moncada's health struggles, and Chance Sisco's new approach.