In a 1998 quarterfinal of the national high school baseball tournament at Kōshien, Yokohama beat PL Gakuen in 17 innings. Yokohama’s ace, Matsuzaka Daisuke, threw 250 pitches.
From the spring tournament of 2018, Kōshien introduced a tiebreak. From the 13th inning, each team began its turn at bat with runners on first and second base and no outs. The start of the tiebreak was later moved to the 10th inning.