Related Clues:

• X-X-X part
• See 99-Across
• Center X?
• Middle O?
• XXX center
• Part of a "Hollywood Squares" winner
• Middle O of O-O-O
• Tic __: mints
• Result of a leadoff walk
• Tic-__-toe
• Middle square, say
• See 6 Across
• Middle of three in a row?
• Middle of XXX or OOO
• Middle of a game