Tennis court dimensions are standardised by the International Tennis Federation (ITF) and have remained virtually unchanged since the modern game was codified in the 1870s. The court is a rectangle 23.77 metres long and either 8.23 metres (singles) or 10.97 metres (doubles) wide. These measurements apply to all surfaces — hard, clay, and grass — and all levels of play from club tennis to Grand Slams.

The net divides the court in half at 0.914 metres (3 feet) at the posts and sags to 0.914 metres at the centre strap. Each half is divided into a service box and backcourt. The service boxes are 6.4 metres deep and 4.115 metres wide — the area the serve must land in. The baseline is the farthest boundary from the net.

Surface type significantly affects the game despite having identical dimensions. Clay courts (Roland Garros) produce high-bouncing, slow rallies. Grass courts (Wimbledon) are fast with low bounce. Hard courts (US Open, Australian Open) are medium-paced. The dimensions remain constant but the tactical game changes completely by surface.