This week's Friday Brain-Teaser from xrefer tests your knowledge of sporting heroes. Answers here.

1. American prizefighter, originally known as Cassius Clay, who won the world heavyweight title in 1964, 1974 and 1978
2. US golfer who won a record 18 professional majors between 1962 and 1986, and captained the US Ryder Cup team (1969-81)
3. Cricketer, born 1969 in Trinidad, who broke several cricketing records in 1994, scoring seven centuries in eight successive innings
4. US baseball player who set a record in 1941 of getting hits in 56 consecutive games. He was married to Marilyn Monroe between January and October 1954
5. Czech-born American tennis player who won the Wimbledon women's singles title a record nine times
6. US black athlete who won four gold medals at the 1936 Olympics in Berlin
7. British cricketer (1848-1915) who captained England in 13 Test matches and scored 126 centuries in his long career
8. US basketball player named by "Sports Illustrated" as the "Best Basketball Player of the 20th Century". In 1992 he became the world's highest paid sportsman
9. Romanian gymnast who won three gold medals at the 1976 Olympics at the age of 14
10. French skier who won all three gold medals at the 1968 Winter Olympics in Grenoble