Word with baseball or tennis

• Like Astrodome events
• Unlike golf, as a rule
• Not outside
• Opposite of "alfresco"
• Like some plumbing
• Word before "voice" or "soccer"
• (Of sports) performed under a roof

Wiktionary Word definitions in Wiktionary
a. Situated in, or designed to be used in, or carried on within the interior of a building.

Wikipedia Word definitions in Wikipedia