Related Clues:

• Both pros and amateurs may be in one
• Take the top off
• Start admitting customers
• Speaking freely
• Major tennis event
• Conceded
• Without concealment
• "I think there's more to this than you care to ___, ___"
• Tourney for all
• Founded upon law
• Uncork
• Airy
• Allowed to enter
• Officially sanctioned
• Done by the book