According to researcher Katie Sharp, that makes Weaver the first pitcher in Yankees history to face that many batters, allow that few baserunners, and give up no runs through his first 10 games of a season.

Let’s put that in perspective. Not Mariano Rivera, Dellin Betances, nor Goose Gossage had as good of a start to the season as Weaver has this year.

The 31-year-old right-hander wasn’t the headline grabber when the Yankees

It was not huge news when the Yankees claimed Weaver as a failed starter off waivers in 2023, but last season, he established himself as an effective reliever. He earned the trust of Yankees manager Aaron Boone, taking over the closing role in the playoffs when closer Clay Holmes faltered.

This winter, he was relegated to the set-up role when the Yankees acquired established closer Devin Williams. But so far, he’s been the most reliable arm in the group, particularly more reliable than Williams.

Weaver hasn’t just been effective — he’s been efficient. Through Tuesday, he’s thrown 12.1 innings, walked five batters, and struck out 12. Opponents are hitting .053 against him, and he has a 0.58 WHIP.

The Yankees are still searching for consistent late-game answers with Williams struggling and Jonathan Loáisiga out for at least a couple of months. They have already leaned heavier on Weaver than many expected. He’s already recorded two saves this season.

This clearly isn’t the same Weaver who bounced around as a starter. The Yankees, under pitching coach Matt Blake, have a good track record of rebuilding pitchers.

Thanks to a few key improvements, he has transformed into a dominant reliever. His four-seam fastball has gained velocity, averaging 93.5 mph and peaking at 95.8 mph, with reduced vertical drop and arm-side run, making it more deceptive to hitters. The changeup has also improved, showing increased movement and a higher whiff rate, rising from 16% in 2023 to 25% in 2024.

The transformation has proven to be real and sustaining.

And now,  Weaver is making history with it.