WTA Premier tournaments

Columns: Tournament | Officially known as | City ( s ) | Country | Surface | Prize ( US $ ) | Current singles champion
Charleston | Volvo Car Open | Charleston | United States | Clay | 823,000 | Madison Keys ( 2019 ) | Stuttgart | Porsche Tennis Grand Prix | Stuttgart | Germany | Clay ( i ) | 886,077 | Petra Kvitová ( 2019 ) | Madrid | Mutua Madrid Open | Madrid | Spain | Clay | 7,021,128 | Kiki Bertens ( 2019 ) | Rome | Internazionali BNL d'Italia | Rome | Italy | Clay | 3,452,538 | Karolína Plíšková ( 2019 ) | Berlin | Grass Court Championships Berlin | Berlin | Germany | Grass | TBD | TBD ( 2020 ) | Eastbourne | Nature Valley International | Eastbourne | United Kingdom | Grass | 998,712 | Karolína Plíšková ( 2019 ) | San Jose | Silicon Valley Classic | San Jose | United States | Hard | 799,000 | Zheng Saisai ( 2019 )

Example questions:
What is the official tournament name of the WTA premier event held in Baden-Württemberg ? | Who was the champion for the WTA tournamnent held at the Khalifa International Tennis and Squash Complex ? | What is the birth year of the WTA Brisbane tournament champion ? | Which WTA premier tournament was won by the player born on 24 April 1996 ? | What type of surface was played on at a WTA tournament in the most populous city of Spain ?

Answers:
Porsche Tennis Grand Prix | Elise Mertens | 1992 | Miami Open | clay