Phoenix Open (tennis)
The Phoenix Open previously known as the Phoenix Thunderbird Championships or Thunderbird Classic or Thunderbird Invitation is a defunct Grand Prix affiliated tennis tournament that started in 1953 and ended in 1970. History. Originally started as an amateur event from 1953 to 1968, the tournament went open in 1969 and ended in 1970. It was held in Phoenix, Arizona in the United States and played on indoor hard courts from 1953 to 1965 and outdoor hard courts from 1966 to 1970. Results. Men's singles. Included: