Indiana University Athletics
2026 Baseball Roster

Jersey Number 18
Ivan Mastalski
- Weight:
- 227
- Height:
- 6-4
- Position:
- RHP
- Year:
- Freshman
- Hometown:
- Saint John, Ind.
- High School:
- Andrean
2026 (Freshman Season)
Season: Made 19 appearances on the mound with four starts in his freshman campaign … was tied for second (19) on the team in appearances … all four starts came in the midweek … tossed 34.2 innings on the year to the tune of a 3.89 ERA … was second in the program in ERA among pitchers with at least 10 innings of action … provided 33 strikeouts and walked just 14 batters … allowed just 15 earned runs on the season … opposing batters hit him at just a .257 clip … picked up his only win of the season in a victory against Wright State (3/10) … made additional starts against Xavier (2/25), Evansville (3/31) and Ball State (4/21) … 11 of his outings went at least two innings … had six consecutive two-inning appearances (2/28 – 3/20) … pitched in the first seven Big Ten weekends before being shut down with arm fatigue … had a multi-strikeout effort in 11 of his outings … recorded a season high four strikeouts in conference debut against Washington (3/7) … his only outings of three innings or longer both came against Ball State (4/7 and 4/21) …. final appearance of the year came against Iowa (4/25).
Prep/Personal
Played for head coach Dave Pishkur at Andrean High School … helped lead the 59ers to the 2025 IHSAA 3A State Championship at Victory Field in Indianapolis … pitched 4.1 innings of one-run baseball in the state finals in 2025 … played travel baseball for USA Prime Midwest Scout … 2024 IHSAA state qualifier in golf … 22nd-ranked recruit in the state of Indiana by Prep Baseball Report … started playing baseball at year four … missed the beginning of his senior season after getting sick and losing 25 pounds … son of Karl and Colleen Mastalski … has three siblings – Maya, Logan and Jax … intends to major in Public Financial Management through the Kelley School of Business.
Season: Made 19 appearances on the mound with four starts in his freshman campaign … was tied for second (19) on the team in appearances … all four starts came in the midweek … tossed 34.2 innings on the year to the tune of a 3.89 ERA … was second in the program in ERA among pitchers with at least 10 innings of action … provided 33 strikeouts and walked just 14 batters … allowed just 15 earned runs on the season … opposing batters hit him at just a .257 clip … picked up his only win of the season in a victory against Wright State (3/10) … made additional starts against Xavier (2/25), Evansville (3/31) and Ball State (4/21) … 11 of his outings went at least two innings … had six consecutive two-inning appearances (2/28 – 3/20) … pitched in the first seven Big Ten weekends before being shut down with arm fatigue … had a multi-strikeout effort in 11 of his outings … recorded a season high four strikeouts in conference debut against Washington (3/7) … his only outings of three innings or longer both came against Ball State (4/7 and 4/21) …. final appearance of the year came against Iowa (4/25).
Prep/Personal
Played for head coach Dave Pishkur at Andrean High School … helped lead the 59ers to the 2025 IHSAA 3A State Championship at Victory Field in Indianapolis … pitched 4.1 innings of one-run baseball in the state finals in 2025 … played travel baseball for USA Prime Midwest Scout … 2024 IHSAA state qualifier in golf … 22nd-ranked recruit in the state of Indiana by Prep Baseball Report … started playing baseball at year four … missed the beginning of his senior season after getting sick and losing 25 pounds … son of Karl and Colleen Mastalski … has three siblings – Maya, Logan and Jax … intends to major in Public Financial Management through the Kelley School of Business.
Jacksonville Baseball Classic - Notre Dame Press Conference
Sunday, February 22
Jacksonville Baseball Classic - UCF Press Conference
Saturday, February 21
Jacksonville Baseball Classic - LSU Press Conference
Friday, February 20
Big Ten Tournament Press Conference - vs. Rutgers
Wednesday, May 21


