 In the Big Ten Conference opener on May 2, 1925, he threw a one-hitter against Illinois, but lost 1–0 after two throwing errors allowed the Illini to score a run.The 1926 "Michiganensian" described the one hit allowed by Jablonowski as a "scratch hit," and some opined that the game should have been called a no-hitter as the hit came on a bobbled ground ball that the Illinois scorer credited as a base hit.As a senior in 1926, Jablonowski helped lead Michigan to another Big Ten Conference baseball championship.