Possible Clues:

• Perennial NL Central cellar-dwellers
• Houston ball team
• Texas nine
• Team that once played at Enron Field
• Texas Rangers' interleague rivals
• Winners of the longest postseason game in major-league history (18 innings, 2005)
• Houston ball club
• Team moving to the American League in 2013
• Texans : NFL :: ___ : MLB
• Club that began as the Colt .45s