沢村栄治賞
Ishii pitched for the Seibu Lions from 1989 through 1997, and the Nippon-Ham Fighters in 1998 and 1999. Going 15–3 with a 1.94 ERA in 1992, he was named Most Valuable Player of the Pacific League, also winning the Eiji Sawamura Award. To cap it off, he compiled a 2–0 record with 2 complete games, allowing 1 earned runs 19 innings, with 18 strikeouts in the 1992 Japan Series, winning the MVP Award as the Lions defeated the Yakult Swallows 4-games-to-3.