Serena Williams is favored to win the U.S. Open. If she does she will have a calendar Grand Slam: winning the Australian Open, French Open, Wimbledon, and U.S. Open in the same year. She will be the first player to do this since Steffi Graf in 1988.

Serena is probably also responsible for another first. This year, for the first time in the history of the U.S. Open (since 1881) the women’s singles finals sold out before the men’s.

Katrina Adams also adds to the firsts since, just this year, she became the first African-American and first former professional tennis player to serve as the USTA’s Chairman of the Board, CEO and President.

How long until women play five sets?