21) How many Grand Slam singles titles does Serena Williams have?
22) What was Serena Williams's ranking in the WTA when she won her first Grand Slam title in 1999?
23) What is the name of the fashion line created by Serena Williams?
24) What is the name of the foundation founded by Serena Williams and Venus Williams?
25) Where was Serena Williams born?
26) What year was Serena Williams inducted into the International Tennis Hall of Fame?
27) What is the name of the book written by Serena Williams in 2017?