Related Clues:

• Diamond officials, informally
• Some tennis judges
• Foul-ball callers
• Quartet assigned to bases
• Frequent callers?
• Three of nine on a ballfield
• World Series game sextet, for short
• Helps out at T-ball, perhaps
• Ones calling people out?
• Stereotypically blind officials, for short
• Ones stationed at home
• Diamond crew, for short
• Baseball's decision-makers on the field
• They call balls and strikes
• World Series sextet, for short