A tennis court (25) comprising a marked-off playing area in the form of a rectangle defined by two parallel sidelines (3, 4) and two parallel baselines (5, 6). Part of the playing area, starting from its centre, is divided into two halves by means of a centre line (7) extending parallel to the sidelines, which halves are further marked off by means of service lines (10, 11) extending parallel to the baselines (5, 6), in such a manner that rectangular service courts (8, 9) are formed within the playing area. These service courts (8, 9) are furthermore marked off to have their width narrowed (21-24, 26-29), at least over part thereof extending from the service line (10, 11). This narrowing (21-24, 26-29) may extend over its entire length of the service courts (8, 9), both adjacently to the sidelines (3, 4) and adjacently to the centre line (7). With such narrowing (21-24, 26-29) the chance of returning a service increases, however without undesirably influencing the speed with which the service can be hit. The narrowing (21-24, 26-29) can be marked off with new tennis courts as well as with existing tennis courts.