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Sam Antonacci Makes MLB Impact as White Sox Utility Player
When Sam Antonacci was recalled to the Chicago White Sox on April 15, 2026, the team added a contact hitter with speed and versatility to its roster. In 49 games through the end of June, the 23‑year‑old has posted a .285 batting average, a .387 on‑base percentage and a .376 slugging percentage. One home run, 15 runs batted in and eight stolen bases round out his rookie line.
Antonacci’s baseball journey began at Heartland Community College, a Division II junior‑college program in Illinois. There he earned NJCAA Division II Player of the Year honors after hitting .515 with 14 home runs and 103 RBIs. In 2024 he transferred to Coastal Carolina University, where he slashed .367/.523/.504 with six home runs and 47 RBIs over 61 games. His 50 walks compared to 40 strikeouts earned him the Sun Belt Conference’s highest on‑base percentage.
Selected in the fifth round (140th overall) of the 2024 MLB draft, Antonacci signed with the White Sox and advanced through the organization’s minor‑league system. In 2025 he appeared in 116 games at the A+ and AA levels, batting .291/.433/.409 with five home runs, 48 RBIs, 57 runs and 48 stolen bases. The following season, he spent 14 games at Triple‑A, hitting .313/.500/.479 with two home runs, seven RBIs and five steals before earning a promotion to the majors.
Antonacci is a contact hitter rather than a power threat. His career MLB fly‑ball rate is 20 %, 6.5 % below the league average, and he ranks in the 29th percentile for expected value, the 33rd percentile for barrel percentage and the 26th percentile for hard‑hit percentage. In contrast, his contact metrics are strong: a 14.8 % strikeout rate (85th percentile), a 16.3 % whiff rate (90th percentile), a 21.5 % chase rate (93rd percentile) and a 31.2 % square‑ball rate (87th percentile). His line‑drive percentage is 41.0 %, placing him in the 93rd percentile for the LA sweet spot. Although his walk rate is low at 6.6 %, his on‑base percentage of .387 exceeds the MLB average of .319.
Speed is a key component of Antonacci’s value. He has stolen eight bases in the majors and five at Triple‑A, and he recorded 48 stolen bases in 2025 across the A+ and AA levels. His ability to reach base and then threaten to steal makes him a valuable asset in fantasy leagues that reward on‑base percentage, runs and stolen bases. Month‑by‑month, his performance has improved. In March and April he hit .225/.347/.425 with a 6 % strikeout rate and a .216 batting‑average‑on‑base‑percentage (BABIP). In May he posted .296/.378/.337, a 19 % strikeout rate and a .382 BABIP. June has been his best month so far, with a .333/.471/.444 line, four walks and four strikeouts in seven games. His 48 stolen bases in 2025 were earned against a league average of 27.5, giving him a success rate of 85 %. The consistency of his stolen‑base attempts has earned praise from coaching staff, who note his quick first step and sound base‑running decisions.
Across the season, Antonacci’s on‑base plus slugging (OPS) stands at .762, with an OPS+ of 116. If he maintains his current pace over a full 162‑game season, projections estimate 50 RBIs, 26 stolen bases, a .387 on‑base percentage and a .762 OPS. These numbers also translate to a solid value in the team's lineup, where he can be inserted in late‑offense situations to spark runs. The White Sox have listed Antonacci as a left‑fielder, third‑base, and second‑base option in Yahoo and ESPN fantasy leagues, and as a shortstop in Fantrax. His positional flexibility adds roster value for teams that need depth in the infield and outfield.
As of the end of June, Antonacci has played 49 games for Chicago, collected 30 hits, hit one home run, driven in 15 runs and stolen eight bases. The White Sox will look to keep him in the lineup for the remainder of the season, as his contact skills and speed continue to contribute to the team’s offensive production. With the White Sox heading into the second half, Antonacci’s continued presence could prove pivotal in the club’s push for a playoff berth. In summary, Sam Antonacci’s promotion to the majors has provided the Chicago White Sox with a contact hitter who can reach base, run the bases and play multiple positions. While he is not a power threat, his on‑base percentage, run production and stolen‑base ability make him a valuable contributor in both real‑world play and fantasy baseball.
Antonacci’s baseball journey began at Heartland Community College, a Division II junior‑college program in Illinois. There he earned NJCAA Division II Player of the Year honors after hitting .515 with 14 home runs and 103 RBIs. In 2024 he transferred to Coastal Carolina University, where he slashed .367/.523/.504 with six home runs and 47 RBIs over 61 games. His 50 walks compared to 40 strikeouts earned him the Sun Belt Conference’s highest on‑base percentage.
Selected in the fifth round (140th overall) of the 2024 MLB draft, Antonacci signed with the White Sox and advanced through the organization’s minor‑league system. In 2025 he appeared in 116 games at the A+ and AA levels, batting .291/.433/.409 with five home runs, 48 RBIs, 57 runs and 48 stolen bases. The following season, he spent 14 games at Triple‑A, hitting .313/.500/.479 with two home runs, seven RBIs and five steals before earning a promotion to the majors.
Antonacci is a contact hitter rather than a power threat. His career MLB fly‑ball rate is 20 %, 6.5 % below the league average, and he ranks in the 29th percentile for expected value, the 33rd percentile for barrel percentage and the 26th percentile for hard‑hit percentage. In contrast, his contact metrics are strong: a 14.8 % strikeout rate (85th percentile), a 16.3 % whiff rate (90th percentile), a 21.5 % chase rate (93rd percentile) and a 31.2 % square‑ball rate (87th percentile). His line‑drive percentage is 41.0 %, placing him in the 93rd percentile for the LA sweet spot. Although his walk rate is low at 6.6 %, his on‑base percentage of .387 exceeds the MLB average of .319.
Speed is a key component of Antonacci’s value. He has stolen eight bases in the majors and five at Triple‑A, and he recorded 48 stolen bases in 2025 across the A+ and AA levels. His ability to reach base and then threaten to steal makes him a valuable asset in fantasy leagues that reward on‑base percentage, runs and stolen bases. Month‑by‑month, his performance has improved. In March and April he hit .225/.347/.425 with a 6 % strikeout rate and a .216 batting‑average‑on‑base‑percentage (BABIP). In May he posted .296/.378/.337, a 19 % strikeout rate and a .382 BABIP. June has been his best month so far, with a .333/.471/.444 line, four walks and four strikeouts in seven games. His 48 stolen bases in 2025 were earned against a league average of 27.5, giving him a success rate of 85 %. The consistency of his stolen‑base attempts has earned praise from coaching staff, who note his quick first step and sound base‑running decisions.
Across the season, Antonacci’s on‑base plus slugging (OPS) stands at .762, with an OPS+ of 116. If he maintains his current pace over a full 162‑game season, projections estimate 50 RBIs, 26 stolen bases, a .387 on‑base percentage and a .762 OPS. These numbers also translate to a solid value in the team's lineup, where he can be inserted in late‑offense situations to spark runs. The White Sox have listed Antonacci as a left‑fielder, third‑base, and second‑base option in Yahoo and ESPN fantasy leagues, and as a shortstop in Fantrax. His positional flexibility adds roster value for teams that need depth in the infield and outfield.
As of the end of June, Antonacci has played 49 games for Chicago, collected 30 hits, hit one home run, driven in 15 runs and stolen eight bases. The White Sox will look to keep him in the lineup for the remainder of the season, as his contact skills and speed continue to contribute to the team’s offensive production. With the White Sox heading into the second half, Antonacci’s continued presence could prove pivotal in the club’s push for a playoff berth. In summary, Sam Antonacci’s promotion to the majors has provided the Chicago White Sox with a contact hitter who can reach base, run the bases and play multiple positions. While he is not a power threat, his on‑base percentage, run production and stolen‑base ability make him a valuable contributor in both real‑world play and fantasy baseball.
