Willson Contreras Out ~2 Weeks: How Much Does Boston Lose?

A hamstring strain sidelines Boston's top offensive bat for roughly 11 games, but a soft schedule and his recent cold stretch blunt some of the damage.

Published: September 2, 2026 · Figures as of September 2, 2026

Asked: How much does losing Willson Contreras hurt Boston?

Contreras is out with a hamstring strain for roughly two weeks

Willson Contreras is genuinely out — a left hamstring strain first reported August 31, with an expected return of September 11 — so Boston plays about 11 games without him (Aug 31 and Sept 1 already gone, plus nine more scheduled through the 11th). He's been Boston's best everyday bat this year, but he'd also cooled off before the injury, and the schedule he's missing is a soft one.

What Boston is missing

Contreras carries a .900 OPS this season (124 games, 517 plate appearances, 26 HR, 79 RBI) — well above the .700 that qualified hitters have produced leaguewide over his own recent window. His full-season batting value is 4.32 WAR. That's the offense side. On defense it's a different story: playing first base rather than catching, he's been below replacement there this year at -0.56 defensive WAR, so Boston isn't giving up plus defense while he sits — only the bat.

That bat had also cooled noticeably right before the injury. Over his last 30 games his OPS was .750, down from .950 in the 95 games before that and below his .900 season mark — still a bit above the league's .700 over the same stretch, but a real step down from his own peak, not just noise.

The schedule he misses

The window runs through Baltimore (69-69, .500), the Angels (53-85, .384) and the start of a Kansas City series (62-76, .449) — three sub-.500-or-even opponents, plus the tail of the Seattle series already played. It's a favorable stretch to be shorthanded in, which cushions the loss somewhat.

Who fills in — unclear from the data

Boston's box scores for the two games already missed (Aug 31, Sept 1) show no player logged at first base at all, while every other club's first baseman that day is recorded normally — a gap in what I can see rather than evidence of how Boston is actually covering the position. Triston Casas is on the roster as a first baseman but has no 2026 game log of any kind — his last recorded appearance was in 2025 — so I can't say he's a ready-made replacement. I don't have a reliable name to give you for who absorbs Contreras's at-bats.

Context and confidence

Boston is 75-63, third in the AL East and 7.5 games back in that race, so a two-week stretch without a middle-of-the-order bat matters for playoff positioning even against a soft slate. Confidence: Medium — the offensive loss (rate stats, WAR, recent form) is well grounded in the data; the replacement question and the exact size of the net impact are not, since the fielding-side coverage is missing for this stretch.

One thing worth flagging alongside this: over that same 30-game window, Wilyer Abreu's OPS moved more than Contreras's did — .78 up to .91, the largest shift on Boston's roster in that stretch — a bigger change than the one your question was about.