Seranthony Ambioris DomÃÂnguez Taveras (born November 25, 1994) is a Dominican professional baseball pitcher for the Chicago White Sox of Major League Baseball (MLB). He has previously played in MLB for the Philadelphia Phillies, Baltimore Orioles, and Toronto Blue Jays. DomÃÂnguez signed with the Phillies as an international free agent in 2011, and made his MLB debut in 2018.
DomÃÂnguez was born in Esperanza Valverde Mao, Dominican Republic. Of his unusual first name, Baseball America reported: "'I'm not sure where it comes from,' Seranthony DomÃÂnguez said with a laugh. 'I think itâÂÂs something my parents heard on TV.'"
DomÃÂnguez signed with the Philadelphia Phillies as an international free agent in October 2011 for $25,000. He made his professional debut in 2012 with the Dominican Summer League Phillies and spent the whole season with them, going 4âÂÂ4 with a 3.48 earned run average (ERA) and 40 strikeouts in 67 innings in 15 games (11 starts). In 2013, he returned to the DSL where he compiled a 4âÂÂ6 record and 2.96 ERA, and 58 strikeouts in 76 innings, in 14 starts. He led the Dominican Summer League in shutouts (2) and complete games (2). In 2014, he played for the rookie-level Gulf Coast League Phillies, for whom he pitched to a 2âÂÂ2 record and 3.12 ERA with 24 strikeouts in 26 relief innings pitched.
DomÃÂnguez spent 2015 with the GCL Phillies, where he was 1âÂÂ1 with a 2.35 ERA with 9 strikeouts in only 7 innings pitched. In 2016 he pitched for both the Low-A Williamsport Crosscutters and Single-A Lakewood BlueClaws, with whom DomÃÂnguez had a combined 6âÂÂ3 record and 2.34 ERA in 13 starts with 65 strikeouts in 65 innings.
In 2017, DomÃÂnguez pitched for the High-A Clearwater Threshers, and compiled a 4âÂÂ4 record and 3.61 ERA with 75 strikeouts in 62 innings in 15 games (13 starts), averaging 10.8 strikeouts per 9 innings. He was a 2017 Florida State League Mid-Season All Star with Clearwater. The Phillies added him to their 40-man roster after the 2017 season, in order to be protected from the Rule 5 draft. In the 2017 off-season, the Phillies organization told him he was being converted into a relief pitcher.
DomÃÂnguez began 2018 with the Double-A Reading Fightin Phils, going 1âÂÂ2 with a 2.08 ERA with 18 strikeouts in 13 innings in 8 games, averaging 12.5 strikeouts per 9 innings, and was promoted to the Triple-A Lehigh Valley IronPigs in late April for whom he was 1âÂÂ0 with a 0.00 ERA in three games. Between the two minor league teams, in innings DomÃÂnguez gave up eight hits and two walks, and struck out 21 batters.
The Phillies promoted DomÃÂnguez to the major leagues on May 7, 2018, and made his MLB debut the same night. He became the only major league reliever in recorded baseball history (dating back to 1908) to record at least two outs and allow no runs, hits, or walks in his first five major-league appearances. He also became the first pitcher in recorded history to not allow a run, hit, or walk in his first six appearances. He recorded his first career save against the St. Louis Cardinals on May 19, and his first win on May 26. DomÃÂnguez tied the all-time record for most perfect appearances (8) in a pitcher's first 11 games, and pitched more innings in those games (10) than any of the other pitchers with whom he was tied. His 0.65 WHIP through the All-Star break (min. 30 IP) was the lowest ever by any Phillie.
In 2018 with the Phillies, DomÃÂnguez was 2âÂÂ5 with 16 saves and a 2.95 ERA, and 74 strikeouts in 58 innings, averaging 11.5 strikeouts per 9 innings. Dominguez ranked in the top 25 in major league baseball (minimum 50 innings) in both strikeout rate and in ground-ball rate. He struck out 32% of batters, best among rookies with at least 55 innings pitched. He also limited all batters to a .156 batting average and 0.93 WHIP (each 4th-best among NL relievers with 50 or more innings pitched), and batters to a .163 batting average in âÂÂhigh-leverageâ situations, as calculated by Baseball-Reference. Batters had a 66.4% contact percentage against him, second-lowest in the NL among pitchers with at least 50 innings pitched. His 16 saves tied Jack Meyer (1955) for the most by any Phillies rookie reliever. Baseball America named him to its 2018 MLB All-Rookie Team, and he was named to Baseball Digests Rookie All-Star team.
In 2019, DomÃÂnguez was 3âÂÂ0 with a 4.74 ERA in innings over 27 relief appearances during which he struck out 29 batters, averaging 10.6 strikeouts per 9 innings. His season ended early with him on the injured list, due to a damaged ulnar collateral ligament in his right elbow.
Dominguez underwent Tommy John surgery on July 30, 2020, more than a year after he was initially placed on the injured list. On February 17, 2021, he was placed on the 60-day injured list as he continued to recover. On September 1, Dominguez was activated off the injured list.
In the 2022 regular season, he was 6âÂÂ5 with nine saves and a 3.00 ERA, as in 54 innings he struck out 61 batters over 54 relief appearances. Dominguez earned the save in game 3 of the NLCS against the San Diego Padres. He pitched in 9 games during the 2022 postseason, allowing 2 earned runs and striking out 18 hitters in innings.
On February 16, 2023, DomÃÂnguez signed a two-year, $7.25 million contract extension with the Phillies.
In 2023, he had a 3.78 ERA and struck out 48 batters in 50 relief innings and 57 appearances. He missed time in June and July due to an oblique strain. He made 6 appearances in the 2023 postseason, allowing no runs and striking out 7 hitters in innings. DomÃÂnguez made 38 appearances for Philadelphia in 2024, compiling a 4.75 ERA with 40 strikeouts across 36 innings. He was the second longest-tenured Phillie prior to being traded, with only Aaron Nola having been a Phillie for longer.
On July 26, 2024, DomÃÂnguez was traded to the Baltimore Orioles alongside Cristian Pache in exchange for Austin Hays. He made 25 appearances down the stretch for Baltimore, posting an 0âÂÂ2 record and 3.97 ERA with 28 strikeouts and 10 saves across innings pitched.
DomÃÂnguez made 43 relief appearances for the Orioles in 2025, compiling a 2âÂÂ3 record and 3.24 ERA with 54 strikeouts and two saves across innings pitched.
On July 29, 2025, in between a doubleheader between the Orioles and Toronto Blue Jays, DomÃÂnguez was traded to the Blue Jays in exchange for pitching prospect Juaron Watts-Brown. During the second game of the doubleheader, he tossed a scoreless inning against his former team. DomÃÂnguez pitched in 24 games for Toronto, logging a 2âÂÂ1 record and 3.00 ERA with 25 strikeouts over 21 innings of work.
On January 29, 2026, DomÃÂnguez signed a two-year, $20 million contract with the Chicago White Sox.
DomÃÂnguez threw four pitches throughout the early half of his career: a four-seam fastball and a sinker, both of which reached up to ; a slider that averaged and had generated a whiff rate of above 50% since his debut in 2018; and a seldom-used changeup at . In 2025, he began throwing a sweeper in lieu of his slider and added a splitter and curveball to his arsenal, greatly improving his performance against left-handed hitters.
DomÃÂnguez is married to Sarahi Dominguez. They have two sons.