For the second time in three years, the Thunder advanced to the semifinals but were unable to take that final step.
Desert Vista, the sixth seed, lost 5-4 to No. 10 Chaparral on Friday at Scottsdale Ranch and Tennis Center.
The match was tied at 4-4, but the Thunder came up short in the No. 3 doubles.
The good news is the Thunder lose only one player from their top six due to graduation.