baseball commentator; baseball pundit
A person who analyzes and comments on baseball, often in media such as TV, radio, newspapers, or online.
After retiring, he appears on TV as a baseball commentator.
解説者 is a general term for a commentator or analyst in any field, while 野球評論家 specifically refers to a baseball commentator with a focus on critique and opinion.
Compound of 野球 (baseball) + 評論家 (critic, commentator).