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The Angels selected Klassen's contract from Triple-A Salt Lake to start Sunday's game against the Mariners, Erica Weston of Bally Sports West reports.

The 24-year-old missed out on the Halos' Opening Day rotation despite a strong showing during spring training, but he'll now make his MLB debut Sunday after Ryan Johnson (illness) was a late scratch. Klassen gave up one run with five strikeouts over 4.2 frames during his lone start for Salt Lake this year and struggled at the Double-A level in 2025 with a 5.35 ERA, 1.49 WHIP and 126:46 K:BB across 102.2 innings.

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