Possible Clues:

• Baseball feat, and a clue to this puzzle’s them answers
• Softball twofer
• The actor starred as twins in the ___
• Tinkers-to-Evers-to-Chance baseball event
• Infield feat
• Diamond feat ... and a hint to 17-, 21-, 35-, 47- and 59-Across
• Exciting inning ender, and an apt description of the answers to the starred clues
• Broadway twofer?
• Pitcher's best friend, it's said
• *Baseball feat