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The Cubs re-signed Thielbar to a one-year contract Tuesday, Jesse Rogers of ESPN.com reports. Thielbar collected a 2.64 ERA and 56:13 K:BB over 58 regular-season innings for the Cubs in 2025. Left-handed batters hit just .161/.211/.276 off the southpaw. Thielbar -- who will turn 39 in January -- will help set up from the left side in the Cubs' bullpen.
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Thielbar tossed a scoreless inning of relief with a strikeout to record a hold in Tuesday's 4-3 win over Atlanta. Thielbar is now up to 19 holds for the year, which is good for second on the team behind Brad Keller's 22. The veteran lefty has been locked in lately, as he's recorded nine straight scoreless appearances. Overall, Thielbar has an elite 1.99 ERA and 0.83 WHIP to go along with 48 strikeouts in 49.2 innings out of the bullpen this season, his first with the Cubs.
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Thielbar, who tossed 1.1 scoreless innings of relief with two strikeouts in Wednesday's win over the Brewers, has 13 scoreless appearances across his last 14 outings. The only blemish in the stretch of scoreless outings for Thielbar was his Aug. 3 appearance when he allowed a game-winning, two-run home run to Baltimore. The veteran southpaw has been outstanding all season for the Cubs, as he now has a 2.12 ERA and 46 strikeouts across 46.2 innings. Thielbar has been particularly tough against left-handed batters, limiting them to just a .125 batting average.
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Thielbar (2-3) allowed two runs on two hits and a walk while retiring only two batters to take the loss in Saturday's 4-3 defeat to the Orioles. After seven scoreless innings from starter Matthew Boyd, relievers Ryan Brasier and Thielbar coughed up the lead in the eighth. The key play was a three-run home run by Gunnar Henderson off Thielbar, which saddled the veteran lefty with the loss. Thielbar still has a strong 2.36 ERA and 0.86 WHIP across 42 innings this season, and he should remain a key piece of Chicago's bullpen despite the hiccup.
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Thielbar tossed a scoreless inning of relief with two strikeouts to earn a hold in Friday's 4-1 win over the Red Sox. After allowing two runs in his last appearance before the All-Star break, Thielbar got back into a groove Friday. The veteran lefty has been scored upon only six times in 41 outings this season, leaving him with a solid 2.23 ERA to go along with 10 holds and two wins out of Chicago's bullpen. After posting a 5.32 ERA last year for Minnesota, Thielbar has bounced back in his first year with the Cubs, working as an effective bridge to closer Daniel Palencia, who earned his 13th save of the season Friday.
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Stats
| Year | Team | APP | GS | INN | W | L | S | K | BBI | HA | ERA | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025 | CHC | 67 | 0 | 58.0 | 3 | 4 | 1 | 56 | 13 | 38 | 2.63 | 0.87 |
| 2024 | MIN | 59 | 0 | 47.3 | 2 | 4 | 3 | 53 | 24 | 50 | 5.32 | 1.56 |







