Juan Soto’s bat has slowed by 2.4 mph this season, and that seemingly small number is threatening to turn the Mets’ $765 million investment into baseball’s most expensive disappointment. 

Through Sunday’s games, the former Yankees slugger who terrorized fastballs en route to the World Series last October now appears completely lost against the same pitches that once made him elite.

The numbers tell a stark story. Soto is slashing a pedestrian .248/.374/.396 with three home runs and a .770 OPS. His OPS+ sits at 122 — above league average (100) but nowhere near the MVP-caliber 178 OPS+ he posted with the Yankees last season when he slashed .288/.419/.569.

When the Mets signed Soto to his 15-year megadeal, they expected production mirroring his 2024 Yankees campaign that earned him third place in AL MVP voting. Instead, they’ve received a shadow of that player, and the culprit appears clear: his diminished bat speed is hampering his ability to handle fastballs.

For casual fans wondering why bat speed matters so much, think of it this way: those extra milliseconds make the difference between catching up to a 95 mph fastball or fouling it off, between driving the ball with authority or making weak contact. It’s the difference between the Soto who changed games with one swing and the current version struggling to impact outcomes.

The decline in bat speed (from 75.4 mph in 2024 to 73.0 mph this season per Baseball Savant) has cascaded through his performance metrics. Year-over-year, his hard-hit rate has tumbled from 57 percent to 50 percent, while his barrel percentage has nosedived from an elite 19.7 percent to a pedestrian six percent. 

In baseball’s data-driven era, these aren’t just numbers but warning flares.

Most revealing is Soto’s performance against fastballs, previously his bread and butter. Last season, he demolished heaters to the tune of a .333 average with 31 home runs and a .709 slugging percentage. 

Yankees fans still remember his ALCS-clinching blast off a 95.2 mph four-seamer that left his bat at 109.7 mph and traveled a projected 402 feet.