Although different groups of people have different demographics, the general breakdown suggests that Reds comprise 25% of the population; Blues 35%; Whites 20%; and Yellows 20%. A 45-question test assesses one's color, based on whether you answer A, B, C, or D.
In 1926, promoter C.C. Pyle created the first professional tennis tour with a group of American and French tennis players playing exhibition matches to paying audiences. The most notable of these early professionals were the American Vinnie Richards and the Frenchwoman Suzanne Lenglen.
As for the history of tennis scoring, there are two background stories: 1  That it has its origin in medieval numerology. The number 60 was considered to be a good or complete number back then, in about the same way you'd consider 100 to be a nice round figure today. The medieval version of tennis, therefore, was based on 60--the four points when 15, 30, 45 (which we abbreviate to 40) and 60, or game.