The highlight of Grove's 1940 season came on August 11 against the Oilers; he pitched a complete game that lasted 12 innings, winning 1–0 against Hall of Famer Dizzy Dean. Grove finished the minor league season with nine wins and eight losses, but the team saw issues with his control, and as a result he spent most of the next season in the minor leagues.
Grove's most significant accomplishment occurred on August 11 against the Oilers; he pitched a complete game that lasted 12 innings, winning 1–0 against Hall of Famer Dizzy Dean. Grove concluded the minor league season with nine wins and eight losses but struggled with control issues, which ultimately led to him spending most of the next year in the minor leagues.