Peiffer begins his second season with the Ducks and second in professional baseball. The right-hander joined the Ducks in August of 2021 after beginning the year with the Williamsport Crosscutters of the MLB Draft League. He made 21 appearances with the Ducks during the regular season, posting a 3-2 record with a 1.69 ERA, one save and 30 strikeouts over 26.2 innings of work. He conceded an earned run in just four of his 21 outings, yielding only five earned runs total, and made seven appearances of more than one inning. The 23-year-old then pitched in three games during the postseason, allowing only one earned run in four innings while striking out four batters.

The Allentown, Pa., native appeared in seven games with Williamsport following his collegiate career at Widener University. He went 1-0 with a 1.46 ERA, one save and 16 strikeouts over 12.1 innings. In his five seasons of college baseball, the righty compiled a 15-10 record with a 3.65 ERA, eight complete games, four shutouts, one save and 176 strikeouts over 202.1 innings across 46 games (31 starts). He was named to the Mid Atlantic Conference in 2020 and twice was named the MAC Commonwealth Pitcher of the Week.