Don Mossi, a left-handed pitcher known for his unique appearance and effective pitching, played in Major League Baseball during the mid-20th century. Born on January 11, 1929, in St. Helena, California, Mossi began his professional baseball career with the Cleveland Indians. He made his MLB debut on April 17, 1954, and quickly established himself as a reliable pitcher.

Mossi's rookie season with the Indians was impressive. He appeared in 40 games, primarily as a relief pitcher, and posted a remarkable 1.94 ERA. His performance helped the Indians secure the American League pennant that year, although they ultimately lost to the New York Giants in the World Series. Mossi's ability to pitch effectively in high-pressure situations made him a valuable asset to the team.

Throughout his career, Mossi was known for his exceptional control and ability to change speeds, which kept hitters off balance. His pitching repertoire included a fastball, curveball, and changeup, all of which he used effectively to retire batters. Despite not having overpowering velocity, Mossi's precision and strategic approach to pitching allowed him to succeed at the highest level.

In 1957, Mossi transitioned from the bullpen to the starting rotation, showcasing his versatility as a pitcher. That season, he recorded a 3.59 ERA and won 11 games for the Indians. His performance earned him a spot in the 1957 All-Star Game, highlighting his status as one of the league's reliable pitchers.

After six seasons with the Indians, Mossi was traded to the Detroit Tigers in 1959. During his time with the Tigers, he continued to excel as both a starter and reliever. In 1961, Mossi had one of his best seasons, achieving a career-high 17 wins and maintaining a 3.04 ERA. His efforts helped the Tigers finish second in the American League standings.

Mossi's tenure with the Tigers lasted until 1963, after which he played for the Chicago White Sox and the Kansas City Athletics. Despite changing teams, he maintained his reputation as a dependable pitcher. Over his 12-year career, Mossi accumulated a 101-80 win-loss record, a 3.43 ERA, and 932 strikeouts in 460 games.

Beyond his statistics, Mossi was often remembered for his distinctive appearance, characterized by his prominent ears and unique facial features. This made him a memorable figure among fans and players alike, often overshadowing his accomplishments on the field.

Don Mossi retired from professional baseball after the 1965 season.