Red Sox's Triston Casas to miss rest of season due to surgery for a ruptured patellar tendon.

Red Sox first baseman Triston Casas will miss the rest of the season after undergoing surgery for a ruptured left patellar tendon, an uncommon injury for baseball players. Casas, who had only played 29 games this year, is in the early stages of his recovery and is set to return for next season's Opening Day. His medical team is optimistic about a full recovery.