Related Clues:

• Things touched in double plays
• Strike zone-watching refs
• Officials calling strikes
• Home plate officials, informally
• Diamond parts that are rounded
• Acids' opposites
• Rules on fouls
• Crew of four on a baseball diamond
• Workers who make lots of calls
• Some work at home
• Cricket officials, for short
• They watch people steal
• Softball refs
• Corners of softball diamonds
• Officials at Phillies games, briefly