Four Austin-area Class 6A teams are still alive, and two of them face off against each other. Vandegrift and San Marcos meet in a 6A-DII Region IV semifinal at 7:30 p.m. Friday at the Alamodome in San Antonio. The other semifinal features Dripping Springs and Castroville Medina Valley, and they'll play at 2 p.m. Friday at Farris Stadium in San Antonio.

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