section of a tennis court used when playing doubles

The section of a tennis court used when playing doubles is called the "doubles alley." The doubles alley is the area between the singles sideline and the doubles sideline on each side of the court. It extends the court width by 4.5 feet (1.37 meters) on each side, making the total width for doubles play 36 feet (10.97 meters) compared to 27 feet (8.23 meters) for singles. This wider playing area allows for four players and is used exclusively in doubles matches, increasing the court's width and providing additional space for volleys and angled shots. So, the "doubles alley" or sometimes "tramlines" are the key sections used in doubles that are not used in singles play.