Josh Lewin has a job description that he can honestly describe as “unique.” He serves as the primary radio voice of the San Diego Chargers for KIOZ, and also partners with Howie Rose in the Mets’ broadcast booth for WOR—making him the only sportscaster in the country to work concurrently as a full-time announcer for NFL and Major League Baseball teams.

Lewin’s bicoastal professional arrangement typically doesn’t pose much of a problem. He skips a handful of late-season Mets games every year when they conflict with his football...