Foster Griffin Is the Only Functioning Arm in Washington's Rotation — and the Numbers Prove It

Foster Griffin went to Miami on Friday and did what he's been doing all season: dominated. The Nationals left-hander matched his career high with seven innings pitched, set a new personal best with nine strikeouts, and lowered his ERA to 2.12 in a 3-2 Washington win over the Marlins at loanDepot park. As MLB.com reported, Griffin has now logged four consecutive quality starts — the only Washington starter with more than two on the year — and carries a 1.4 WAR that stands alone atop a rotation where every other arm has combined for negative-0.5 WAR and a 6.01 ERA.

The performance Friday wasn't pristine from the jump. Griffin surrendered a leadoff homer to Xavier Edwards on an elevated fastball, then gave up a double to Otto Lopez on a poorly located splitter, digging himself a 2-0 hole on 25 first-inning pitches. What followed was a masterclass in mid-game recalibration. Griffin identified the problem — too nibbling, not attacking — and flipped a switch. Over his final six innings he allowed nothing, got ahead in the count on seven of his nine strikeout victims, and generated consistent weak contact with a seven-pitch arsenal leaning heavily on his cutter (37% usage). Manager Blake Butera trusted him back out for the seventh at 91 pitches, and Griffin rewarded that trust by retiring the side.

The $5.5 million one-year deal the Nationals handed Griffin this winter looks like highway robbery right now. He's held opponents to a .138 average with runners in scoring position and carried an active scoreless innings streak entering Friday that was tied for eighth-longest in baseball. The qualitative piece matters too — Griffin isn't running on empty, he's executing. His cutter has become a genuine weapon against both lefties and righties, giving him a way to control the inner half without relying on the splitter that got him into trouble in the first inning.

For bettors, Griffin's strikeout line deserves serious attention every time he takes the mound. Nine punchouts Friday is a new career high, and his stuff-to-command combination is exactly the profile that produces consistent strikeout totals. If sportsbooks are pricing his K prop in the 5.5-6.5 range — as they typically do for a soft-market pitcher like Griffin — that number is almost certainly too low given his current arsenal and the weak lineups the NL East serves up. His next matchup will determine the ceiling, but against teams like Miami that swing early and lack plate discipline, fade the under on his strikeout prop without hesitation.

The Washington team total angle is more nuanced. The Nationals' offense is inconsistent enough that backing their run line is a grind, but Griffin's ability to keep games close — 2.12 ERA, deep into games, limiting baserunners in high-leverage spots — means first-five-inning unders and NRFI bets in his starts have real value when he's facing a comparable or weaker lineup. He doesn't miss bats at a Jacob deGrom rate, but he controls damage and keeps counts in his favor. In a market that undervalues consistency, Griffin is the rare mid-rotation arm producing ace-tier betting utility.