OWL Arena is a multi-purpose indoor sports arena, located in Halle, North Rhine-Westphalia, in Germany. The capacity of the arena is 12,300 people and it opened in 1993.
It hosts the Halle Open every year in June. It is one of the few grass court tennis tournaments around.
The stadium has a retractable roof which can be closed in 88 seconds, which rules out the risk of tennis matches having to be suspended because of rain.