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Cal State San Marcos Athletics

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CAL STATE SAN MARCOS COUGARS

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2025 Baseball Roster

Greg Siller
Greg Siller
Greg Siller
Greg Siller
Greg Siller
Greg Siller
Greg Siller
Greg Siller
Greg Siller

8 Garrett Teunissen

8 Garrett Teunissen

  • Position:
    Infielder
  • Class:
    Senior
  • Height:
    5-9
  • Weight:
    185
  • Hometown:
    Corona, Calif.
  • Prev School:
    Mt. San Jacinto College

Summary

Biography

ACADEMIC AWARDS
  • D2 ADA Academic Achievement Award (2023-24)
  • CSC Academic All-District (2024)
  • CCAA Spring Academic Honor Roll (2024)

ATHLETIC AWARDS
  • ABCA/Rawlings All-West Region first team (2024)
  • NCBWA All-West Region second team (2024)
  • D2CCA All-West Region second team (2024)
  • NCBWA West Region Player of the Week (March 12, 2024)
  • CCAA Player of the Year (2024)
  • All-CCAA first team (2024)
  • CCAA Player of the Week (March 11, 2024)

AS A SENIOR IN 2025
  • Started in all 48 games.
  • Hit .301 with 53 hits, 38 runs, 31 RBIs, 26 walks, 12 stolen bases, nine doubles, six home runs, a triple, a .466 slugging percentage, a .408 on-base percentage and an .874 OPS.
  • Recorded a season-best four RBIs at San Francisco State (March 21).

AS A JUNIOR IN 2024
  • Played in all 48 games and started in 47.
  • Led the team with a .380 batting average, 68 hits, 48 runs, 16 doubles and 22 stolen bases while recording 44 RBIs, 17 walks, five home runs, two triples, a .575 slugging percentage and a .445 on-base percentage.
  • Batting average and stolen base total led the CCAA.
  • Led the conference and ranked sixth nationally with 12 sacrifice bunts.
  • Led the team with 23 multi-hit games and had three hits in eight games.
  • Had hitting and reached-base streaks of 13 games.

AS A SOPHOMORE AT MT. SAN JACINTO COLLEGE IN 2023
  • Played in 39 games.
  • Hit .352 with 51 hits, 46 RBIs, 28 runs, 23 walks, 16 stolen bases, 11 doubles, seven home runs, three triples, a .614 slugging percentage and a .451 on-base percentage.
  • Earned All-Inland Empire Athletic Conference first-team honors.

AS A FRESHMAN AT MT. SAN JACINTO COLLEGE IN 2022
  • Played in 21 games.
  • Hit .393 with 11 hits, six RBIs, six runs, three walks, two stolen bases and a double.

HIGH SCHOOL
  • 2021 graduate of Hillcrest High School in Riverside, California.
  • Earned All-River Valley League honors in 2019 and 2021.
  • Was Team MVP and Offensive Player of the Year in 2021.
  • Earned Defensive Player of the Year honors in 2019.
  • Had a career batting average of .394.

PERSONAL
  • Born in Anaheim, California.
  • Hometown is Corona, California.
  • Son of Johnny and Yolanda Teunissen.
  • Enjoys playing ping pong and video games.
  • His parents are his greatest influence.
  • Favorite movie is "Spider-Man".
  • Roots for the Boston Red Sox and New England Patriots.
  • Favorite athlete is Mookie Betts.
  • Majoring in Business Finance.
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Historical Player Information

  • 8

    2024Junior

    Infielder
    5'9" 185 lbs
    8
  • 8

    2025Senior

    Infielder
    5'9" 185 lbs
    8