“Asking if a tennis ball is one color or the other, yellow or green, is like having to decide if the ocean is green or blue," according to Behr paint color expert Erika Woelfel.

Color triggers emotion, meaning the color of the mark on your golf ball could impact how you think and perform on the golf course. We investigate.

By rule of tennis law—specifically, the International Tennis Federation, or ITF—a tennis ball should be yellow in color. The edict was handed down in 1972, after television viewers had trouble ...