Kvitová first gained notice upon defeating then-world No. 1 Dinara Safina in the third round of the 2009 US Open. This was followed by her first Grand Slam semifinal appearance at the 2010 Wimbledon Championships where she came up short to eventual champion Serena Williams. Then, during her breakthrough season in 2011, Kvitová won her first Grand Slam title at the Wimbledon Championships, defeating Maria Sharapova in the final, thus becoming the first player of either gender born in the 1990s to win a Grand Slam tournament title. She remained the only player of either gender born in the 1990s to have won a Grand Slam singles title until the 2016 French Open where Garbiñe Muguruza triumphed. At the end of the season, she won the WTA Tour Championships, thus becoming the third player to win the tournament on debut, the others being Williams and Sharapova. She also helped lead the Czech Republic to victory in the Fed Cup final that same year, making it the Czech Republic's first Fed Cup title as an independent nation.