Boston Red Sox thumb|A 1933 Goudey baseball card of Grove Grove was unable to contribute substantially during his first year in Boston, an arm injury holding him to an 8–8 record. In 1935, however, Grove returned to form with a 20–12 record and a league-leading 2.70 ERA. In the 1936 season, he had a 2.81 ERA (winning his seventh ERA title) while recording a 17–12 record and 130 strikeouts. Grove won his eighth ERA title a year later, while having a 17–9 record along with 153 strikeouts. He pitched 262 innings for the season; this was his 11th and final season where he pitched over 200 innings. Grove continued to post outstanding records, including 14–4 in 1938 and 15–4 in 1939, as well as leading the AL in ERA four times between 1935 and 1939. He had a 7–6 record in 1940 while recording a 3.99 ERA with 62 strikeouts in 153.1 innings. In Grove's last season, he won and lost seven games, winning his 300th game on July 25 (giving up six runs on 12 hits, but winning 10–6), before losing his last three major league games, ending his career on September 28, pitching just one inning in the second game of a doubleheader.
Boston Red Sox thumb|A 1933 Goudey baseball card of Grove Grove was unable to contribute substantially during his first year in Boston, an arm injury holding him to an 8–8 record. In 1935, however, Grove returned to form with a 20–12 record and a league-leading 2.70 ERA. In the 1936 season, he had a 2.81 ERA (winning his seventh ERA title) while recording a 17–12 record and 130 strikeouts. Grove won his eighth ERA title a year later, while having a 17–9 record along with 153 strikeouts. He pitched 262 innings for the season; this was his 11th and final season where he pitched over 200 innings. Grove continued to post outstanding records, including 14–4 in 1938 and 15–4 in 1939, as well as leading the AL in ERA four times between 1935 and 1939. He had a 7–6 record in 1940 while recording a 3.99 ERA with 62 strikeouts in 153.1 innings. In Grove's last season, he won and lost seven games, winning his 300th game on July 25 (giving up six runs on 12 hits, but winning 10–6), before losing his last three major league games, ending his career on September 28, pitching just one inning in the second game of a doubleheade!r.