[Merkle923]

Looks vaguely like Tom Dettore, the lefty of the Cubs of '74-75. But he doesn't exactly fit the alphabetical sequence (his last name should be a Dee or Def) and I see nothing suggesting Dettore was ever in camp with Cincinnati.

Sleuths?

(Mr. Lumpkin has, below, correctly ID'd this as the longtime Senator/Ranger lefty pitching prospect Art DeFilippis).