United States tennis player who in 1938 was the first to win the Australian and French and English and United States singles championship in the same year (1915-2000)

For unmarried persons, or catering especially to unmarried persons, Of or pertaining to unmarried people, noun_ Plural form of single, tennis played with one person on each side, badminton played with one person on each side, verb_ Third-person singular simple present indicative form of single