
Game, set and catch of the day? Polish architect Kotala Krzysztof has come up with a unique court concept which would allow tennis matches to be contested underwater.

Serving up underwater tennis does not come cheap. Krzysztof, who is reportedly seeking investors to set up the project off the coast of Dubai, estimates the court will cost between $1.7-2.5 billion to build.

In case the tennis isn't up to scratch, the underwater court is designed to offer spectacular views of nature and could be built under the sea. The main arena is planned to seat 10,000 spectators.

Double grand slam champion Andy Murray uses sea swimming as part of his Miami training regime but how would the world No. 3 feel about playing tennis in the deep?

Top-20 female player Sabine Lisicki is used to getting up close with marine wildlife. The German swam with dolphins ahead of the 2015 Miami Open.

Rafael Nadal and Serena Williams have already dabbled in water tennis, playing on a court constructed in the middle of a swimming pool at the Hotel Gansevoort in Miami South Beach, Florida.