Pirates' Reliever Stepping Up When Needed Most

The Pirates also recalled Eisert on Sept. 8, when they placed right-handed pitcher Isaac Mattson on the 15-day injured list with right hip impingement.

Eisert has taken advantage, throwing 6 1/3 scoreless innings in four appearances this month.

If you lengthen that time span to include Eisert's previous stint with the Pirates in July, he has thrown 8 1/3 scoreless innings; the reliever threw 2 1/3 scoreless innings on July 28.

He has surrendered just one hit while striking out seven, a stretch that stands in stark contrast to his uneven summer.

A Rough Start for Eisert with the Pirates

The Pirates acquired Eisert and infielder Jacob Gonzalez in a trade with the Chicago White Sox on July 10, but the southpaw struggled early on.

Eisert posted a 7.71 ERA over seven innings in his seven appearances for the Pirates in July, and also posted a 5.73 ERA in June with the White Sox.

Eisert found success at Triple-A Indianapolis, posting a 2.08 ERA over 10 appearances and 13 innings pitched, and he's continued that with the Pirates.

His performance for the Pirates was so clutch because it came in a bullpen game, and he got seven big outs.

It was the kind of outing that has become increasingly common for the 28-year-old lefty.

Eisert got revenge on the White Sox at Rate Field on Sept. 9, throwing another 2 1/3 scoreless innings, with no hits, five strikeouts and stranded two inherited runners in the eventual 4-2 victory.

One Big Reason For Eisert's Success

The success starts with his extension. Eisert's 7.2-foot extension ranks in the 95th percentile of all pitchers, a trait that makes his fastball play well above its pedestrian 90.1 mph average velocity.

That extension effectively shortens the distance between his release point and the plate, giving hitters less time to react. Opponents have hit just .211 against his fastball this season.

Eisert's pitch mix remains relatively balanced. He throws his fastball 39% of the time, a slider 35%, a changeup 19%, and a sinker 7%.

The combination has helped him miss bats at a rate that belies his modest velocity. Earlier this season, he ranked in the 80th percentile in strikeout rate and the 88th percentile in whiff rate.

Eisert Fighting For Place in 2027

This September audition carries weight beyond the standings. With Yates' future uncertain and Pittsburgh's bullpen roles unsettled, Eisert is effectively trying out for a permanent spot in next season's relief corps. Every clean inning is an argument for his inclusion.

For a Pirates team clinging to slim playoff hopes, Eisert has done more than audition; he has kept Pittsburgh in games, providing the multi-inning reliability managers covet this time of the year.

Eisert also provides the Pirates a southpaw with a unique arm slot and a different look to their bullpen.

Whether the postseason remains within reach or not, Eisert has made a compelling case that he belongs with the Pirates next season.