Baseline: This indicates the boundary of the court lengthwise. When a player is serving, they must stand behind this line. Also, if a player hits a shot that lands past the baseline, it is considered “out,” and that player loses the point. Doubles Line: This line is only relevant during doubles matches.
Doubles was short and wide. - So during serves the side tramlines are in but the back tramlines are out. After the serve the whole court is in which means the side tramline and back tramlines are in.
Each doubles service court is bounded by the short service line, the centerline, the doubles sideline, and the doubles back service line. Its dimensions are 13 feet (3.96 m) long by 10 feet (3.05 m) wide. It is sometimes referred to as short and . The side alley is in bounds; the back alley is not.
The outermost lines form the doubles court. So in a doubles rally, the shuttle is allowed to land anywhere on the court. The singles court is slightly narrower than the doubles court. The singles side lines are not the outermost lines, but the next ones in.
In singles the court is thinner, with the wide, outside 'tramlines' out of bounds. In doubles the court is full width and these tramlines are now 'in'. During service in doubles, the court is short, with the rear 'tramlines'at the back of the court, being out of bounds until the serve is returned.
The doubles service courts are slightly different. They are wider, because they use the outside side line (remember: the doubles court is wider); and they are shorter, because they use the inside back line. That's what the inside back line is for: doubles service, and nothing else.
The court boundaries for doubles and singles are different. In singles the court is thinner, with the wide, outside 'tramlines' out of bounds. In doubles the court is full width and these tramlines are now 'in'.
- A legal doubles serve would land in the area bounded by the center line, the doubles long service line, the doubles side line and the short service line (short and wide). - Once the serve is made in doubles, the court area is bounded by the doubles sideline and the back boundary line.
The outer sidelines are marked 5.18m (17.00ft) apart and run parallel to one another. Any shot that lands inside the doubles sideline is considered “in” or valid for doubles matches. If the shuttlecock lands outside the outer sideline in doubles, it is considered out of play.