IP 146.0
ERA 2.90
WHIP 1.342
BB/9 2.7
SO/9 7.5
  • Full name Michael Anthony Koval
  • Born 04/20/1995 in Alta Loma, CA
  • Profile Ht.: 6'1" / Wt.: 180 / Bats: R / Throws: R
  • School Cal Poly Pomona
  • Drafted in the 11th round (327th overall) by the Seattle Mariners in 2016 (signed for $100,000).
    View Draft Report
    Koval pitched on Cal Poly Pomona's back-to-back Division II College World Series teams. In 2015, he worked mostly in relief, but with Cody Ponce gone to the Brewers as a second-round pick, Koval stepped into the rotation this season and wound up the ace, despite working from a lower arm slot. At 6-foot-1, 175, Koval had lost a bit of velocity as he neared 100 innings. He sinks his lively heater, which has touched 93 and was sitting 88-91 mph late in the season, and commands it well. He works a solid-average slider away from righthanded hitters with a decent changeup he can use to keep lefthanded hitters off-balance.

Top Rankings

Draft Prospects

Career Transactions

  • Modesto Nuts released RHP Michael Koval.
  • Modesto Nuts activated RHP Michael Koval from the 7-day injured list.
  • RHP Michael Koval assigned to Modesto Nuts from Mariners Extended Spring Training.
  • RHP Michael Koval assigned to Mariners Extended Spring Training from Modesto Nuts.
  • Modesto Nuts activated RHP Michael Koval from the 7-day injured list.
  • Modesto Nuts placed RHP Michael Koval on the 7-day disabled list.
  • RHP Michael Koval assigned to Modesto Nuts from Clinton LumberKings.
  • RHP Michael Koval assigned to Seattle Mariners.
  • RHP Michael Koval assigned to Clinton LumberKings from Everett AquaSox.
  • RHP Michael Koval assigned to Everett AquaSox from Clinton LumberKings.
  • RHP Michael Koval assigned to Clinton LumberKings.
  • RHP Michael Koval assigned to Everett AquaSox.
  • Seattle Mariners signed RHP Michael Koval.

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