Six weeks into the MLB season, the numbers are starting to tell a compelling story—and for some of the game's biggest names, that story is one of frustration. While the scoreboard shows disappointing results, advanced metrics suggest a major turnaround could be just around the corner. Let's dive into five hitters whose underlying performance screams "breakout incoming."

Fernando Tatis Jr. – San Diego Padres
Once the electric superstar who lit up highlight reels, Tatis Jr. has struggled out of the gate in 2026. Through 38 games, he's yet to hit a home run, posting a .248/.317/.298 slash line that would be among the worst of his career. But don't let the surface stats fool you. His expected weighted on-base average (xwOBA) is nearly 70 points higher than his actual wOBA, suggesting bad luck and defensive positioning are robbing him of production. Tatis ranks in the top ten league-wide in hard-hit rate (58.8%) and average exit velocity on his hardest-hit balls (105.4 mph). When you're making that kind of contact, the results are bound to follow. Expect a superstar resurgence soon.

Ke'Bryan Hayes – Pittsburgh Pirates
Few players in baseball have a wider gap between expected and actual production than Hayes right now. His xwOBA sits at a respectable .311—roughly league average—but his actual wOBA is a paltry .195. That 116-point chasm is a red flag for regression in the right direction. Even more striking: Hayes' expected slugging percentage (xSLG) is .418, a staggering 185 points higher than his actual .233 slugging. That means he's squaring up pitches that normally produce extra-base hits, only to see them turn into outs. The law of averages is on his side.

Ketel Marte – Arizona Diamondbacks
Marte is a classic case of good process, bad results. He's above the league average in hard-hit rate (40%), barrel rate (7%), and exit velocity (88 mph)—all signs of a hitter who is squaring the ball up consistently. Yet his actual numbers tell a different story: a .210/.261/.357 slash line, among the worst of his career. His BABIP sits at just .228, well below his career norms, and there's a 73-point gap between his expected and actual production. When a player with Marte's track record is hitting the ball this well, the hits will start falling.

One to Watch: New Closers Emerging
As we track these offensive breakouts, don't miss the shifting bullpen landscape in Baltimore, San Francisco, and Cincinnati, where new closers are stepping up to lock down games.

For now, keep an eye on these hitters. In baseball, the numbers don't lie—they just take a little time to catch up. When they do, these five could be the difference-makers your fantasy team or favorite club needs.