Lucie Hradecká (born 21 May 1985 in Prague) is a professional tennis player from the Czech Republic. In her career, Hradecká has won 13 WTA doubles titles, including the 2011 French Open, in which she won her first Grand Slam title.

Hradecká has won 18 ITF singles titles, but no WTA singles titles. She has won 11 WTA and 29 ITF doubles titles.

She won her first doubles title on the WTA Tour in 2006 at Portorož with partner Renata Voráčová, as the fourth-seeded team. In the final, the Czech team defeated Eva Birnerová and Émilie Loit, the second seeds, by walkover. They also had a victory over the top seeds Maria Elena Camerin and Emmanuelle Gagliardi in the semifinal.

She reached the third round of doubles competition with Hana Šromová as qualifiers at the 2006 Wimbledon Championships before going down to fifth seeds Meghann Shaughnessy and Anna-Lena Grönefeld. En route they defeated twelfth seeds Svetlana Kuznetsova and Amélie Mauresmo, both Grand Slam singles champions at the time and the previous year's Wimbledon doubles runner-ups by walkover.

Serena Jameka Williams (born September 26, 1981) is an American professional tennis player and a former world no. 1. The Women's Tennis Association has ranked her world no. 1 in singles on five separate occasions. She became the world no. 1 for the first time on July 8, 2002 and regained this ranking for the fifth time on November 2, 2009. She is the only female player to have won over $35 million in prize money.

Her 27 Grand Slam titles places her ninth on the all-time list: 13 in singles, 12 in women's doubles, and 2 in mixed doubles. She is the most recent player, male or female, to have held all four Grand Slam singles titles simultaneously and only the fifth woman in history to do so. She was also the first woman, along with sister Venus Williams, to hold all four Grand Slam doubles titles simultaneously since Martina Hingis did so in 1998. Her 13 Grand Slam singles titles is sixth on the all-time list. Williams ranks fourth in Grand Slam women's singles titles won during the open era, behind Steffi Graf (22 titles) and Chris Evert and Martina Navratilova (18 titles each). She has won more Major titles in singles, doubles, and mixed doubles than any other active player, male or female.