Tennis court line color rules are simple: the lines used for tennis must all be the same color, and that color must clearly stand out from the court surface. White is common, but it is not the only acceptable choice.
That distinction matters when you’re checking a close call, playing on a blue hard court, or sharing a court with other sports. Here’s what the rules say, how line colors work on different surfaces, and what to look for on a multi-use court.
What the Rules Say About Tennis Court Line Colors
Under the ITF Rules of Tennis, all tennis court lines must be the same color and must clearly contrast with the color of the court surface. The rules do not require tennis lines to be white. They do require them to be easy to see against the surface.
So, for example, white lines on a blue hard court or a red clay court are familiar choices. Another line color can work too, as long as every tennis line matches and players can clearly distinguish the lines from the playing surface.
The rule is about visibility, not decoration. If a line blends into the court, players may struggle to judge whether a ball landed in or out. If the court has additional markings for another sport, those markings should not make the tennis lines hard to identify.
Why Line Color Matters During Play
A tennis ball that touches any part of a boundary line is considered in. That includes the singles or doubles sideline, baseline, service line, and center service line. Because a ball may clip a line by only a small amount, clear contrast helps players and officials make accurate calls.
Think of a serve that lands close to the service line. If the line is easy to see, the receiver can make a quick call and keep the point moving. On a faded court, or one with several competing sets of markings, the same call can become a source of confusion.
Line color does not change the dimensions of the court or whether a ball is in. It helps players see the court boundaries; the ball’s position relative to those boundaries decides the call.
Does Every Tennis Court Have to Use White Lines?
No. White lines are traditional and widely used, but the ITF rule focuses on contrast and consistency rather than a single required color. Line color may vary with the surface and the way a court is set up.
| Court setting | Common approach | What matters |
|---|---|---|
| Hard court | White lines on a blue or green surface | Lines should stand out clearly from the court. |
| Clay court | White lines | Lines must remain visible against the clay. |
| Grass court | White lines | Markings should be clear and easy to follow. |
| Multi-use court | Different colors for different sports | Tennis lines should be easy to distinguish from other markings. |
These are common choices, not a rule that each surface must use a particular line color. A club or facility can choose a different color if it still provides clear contrast and keeps the tennis markings consistent.
How Line Color Works on Multi-Use Courts
Shared courts often have lines for basketball, volleyball, or other sports. Those extra markings may use different colors, but they can make it harder to pick out the tennis court at a glance. Before playing, identify the tennis baselines, sidelines, service lines, and center marks so you don’t mistake another sport’s marking for a tennis boundary.
If you’re responsible for marking a shared court, use one consistent color for all tennis lines and make them visually distinct from the other sports’ lines. Avoid placing a second marking so close to a tennis line that it looks like part of the tennis court. The goal is for players to know which boundaries apply without having to guess during a point.
A faded line can cause a similar problem even when the court has no other sports markings. If the tennis lines are difficult to see, ask the facility whether the court is due for repainting or remarking. Don’t assume a ball is out just because a worn section of line is hard to spot.
Line Color and Line Width Are Separate Rules
Color and width are different requirements. The ITF rules set limits on how wide the court lines may be: the baselines can be up to 4 inches wide, while the other lines can be up to 2 inches wide. Service lines must be at least 1 inch wide. These measurements help keep the court markings consistent.
Width can affect a close call because a ball touching the line counts as in. But a wider line is not a different-colored area or a separate target. The line itself forms part of the court boundary.
Frequently Asked Questions
Can tennis court lines be yellow?
Yes, provided all the tennis lines are the same color and clearly contrast with the court surface. White is common, but the rule does not make it the only option.
Can different tennis lines on the same court be different colors?
No. The tennis lines should all be the same color. A shared court may have other sports markings in different colors, but the tennis markings should remain consistent and easy to tell apart.
Does a ball touching a colored line count as in?
Yes. If the ball touches any part of the relevant tennis boundary line, it is in. The line’s color does not change how the call is judged.
Are the baseline and service line allowed to be different widths?
Yes. The rules allow baselines to be wider than other court lines, while also setting limits for line widths. Line width does not change the requirement that all tennis lines be the same color.
Final Thoughts
Tennis court line color rules come down to consistency and visibility: all tennis lines must be the same color, and they must clearly contrast with the surface. White is a popular choice, not a universal requirement. On any court, make sure you can identify the tennis markings clearly—and remember that a ball touching a line is in.
