Mike Napoli isn’t the only former Texas Ranger to make the move up to Boston this season. Reliever Koji Uehara also called Arlington home last year, and the 38-year-old right-hander has made quite the impression on Red Sox fans during his short tenure with the team.

Through his 13 appearances, Uehara holds a 1.54 ERA and has struck out 14 over 11 2/3 innings. He’s also become known for his boundless enthusiasm, as he is often seen high-fiving everyone in the Red Sox dugout after coming off the mound.

Don Orsillo and Jerry Remy broke down what has made Uehara so effective during Red Sox GameDay LIVE on Friday. Check it out in the video above.