Foster Griffin trade grades for Guardians, Nationals

It was evident based on the Cleveland Guardians’ dealings during the 2026 MLB trade deadline that they’re gunning for the AL Central crown. Not only did they acquire outfielder Jo Adell and infielder Nathaniel Lowe to bolster their ailing offense that ranks 29th in MLB in runs scored, they also acquired 31-year-old lefty Foster Griffin from the Washington Nationals to shore up their rotation.

The Guardians gave up four players to the Nationals in exchange for Griffin, namely big-league reliever Will Dion, minor-league pitchers Josh Hartle and Kendeglys Virguez, and minor-league outfielder Nick Mitchell. None of those players are very highly-touted, although MLB.com has Hartle as the 25th-ranked prospect in the Guardians’ system prior to the trade.

How did the Guardians and Nationals fared in this trade? Here are grades for both teams after completing one of the trade deadline’s most reasonable deals.

Guardians believe in Foster Griffin’s breakout

Now 31 years of age, Griffin doesn’t have the best track record in the big leagues. He flamed out in 2022 after recording an ERA of 8.53 in 6.1 innings of work. But the Nationals decided to take a chance on him after three impressive seasons away from the big leagues, signing him to a one-year, $1.6 million contract in the offseason.

Griffin had spent 2023 to 2025 pitching in Japan, and that’s where he remade himself as a starter. He figured something out during his time overseas, and he has carried that over to the big leagues, and the Guardians believe that his breakout is for real.

At the time of the trade, Griffin is sporting a 3.06 ERA in 22 starts (122.1 innings pitched), and he even made it to the All-Star Game. On the season, his contributions have been worth 1.6 fWAR.

Knowing how the Guardians operate, Griffin was always going to be a tantalizing trade option. They did not have to break the bank to get him, and they only had to part ways with one top-30 prospect to bring in a rental. Considering how Griffin doesn’t have the longest track record of big-league success, Cleveland has to be thinking that they can extend him to a team-friendly contract once he hits free agency.

Griffin limits hard contact, and he keeps hitters off balance with a deep repertoire of pitches. He’s a bit home-run prone, but the important thing is that he gets results.

The Guardians didn’t surrender too hefty of a prospect package to trade for Griffin, and Griffin fortifies what is already a strong starting rotation consisting of Gavin Williams, Parker Messick, Joey Cantillo, and Tanner Bibee. They are acquiring the 31-year-old to be a middle/back of the rotation piece, and that’s exactly what he’ll be as Cleveland looks to strengthen ahead of the stretch run.

Grade: A

Could Nationals have gotten better package for Griffin?

The Nationals did seem to prioritize quantity over quality in the haul they got for Griffin, and it seems as though they missed an opportunity to simply re-sign the 31-year-old after unearthing him as a diamond in the rough. Nonetheless, the Nationals know that they might be ahead of schedule, and decided to take on four lottery tickets in exchange for someone who could have left them with nothing by departing in free agency.

Hartle is the crown jewel of this return, but scouts don’t seem to be particularly excited over his long-term prospects. The 23-year-old doesn’t have the best stuff, and that’s due to his four-seamer that sits in the low-90s.

But Washington has made it evident over the past few days that they are looking for pitching prospects who can contribute within a year or two, and Hartle, who is currently in Double-A with an ERA of 3.86 across 93.1 innings (19 starts) fits that bill.

Continuing the Nationals’ relentless hunt for more quality pitching, Dion and Virguez could potentially be good pieces for their bullpen moving forward. Dion already made it to the majors in 2026, recording a 4.58 ERA in 19.2 innings (12 relief appearances), and his stuff appears to be working in the big leagues as well, having struck out 25.

Virguez has been striking out over 14 batters per nine innings in the minors this year, and he already made it to Double-A, like Hartle. In 2027, perhaps the 22-year-old could make an impact for the Nationals’ big-league squad.

Mitchell, meanwhile, has an OPS of .718 in Double-A, although he has shown that he can get on base (OBP of .358 against a batting average of .240).

None of the prospects the Nationals got have too much upside, but getting four lottery tickets in exchange for a rental can never be frowned upon. Washington is losing ground in the hunt for a postseason spot anyway, so making moves with an eye towards the future makes sense as they look to complement their excellent position player core with some quality pitching.

Grade: B-