No — there is currently no reliable public source that explicitly confirms Mason Montgomery is left-handed for general activities like writing.

Mason Montgomery is an American professional baseball pitcher in the Tampa Bay Rays organization. Born in Port Neches, Texas, he played college baseball at Central Arizona College and then at Texas Tech University before being drafted.

Montgomery was selected by the Tampa Bay Rays in the sixth round of the 2021 Major League Baseball draft. He quickly began his professional career, progressing through the Rays' minor league system as a promising pitching prospect.

Known for his impressive left-handed pitching, Montgomery relies on a strong fastball and a developing arsenal of off-speed pitches. He has garnered attention for his strikeout capabilities and control on the mound.

As a left-handed pitcher, Montgomery offers a valuable asset to any pitching staff, particularly in matchups against left-handed batters. He continues to develop his skills in the minor leagues with aspirations of reaching Major League Baseball.