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After getting past Kiki Bertens 7-6 (5) 6-3 at the U.S. Open, Serena Williams needs five more wins to achieve the rare calendar-year grand slam. Elsa/Getty Images North America/Getty Images
Williams seemed more relieved than anything else. She won despite hitting 10 double faults, including four in one game. Matthew Stockman/Getty Images North America/Getty Images
Rafael Nadal, in a slump, didn't play his best against Argentina's Diego Schwartzman but still won in straight sets. Clive Brunskill/Getty Images North America/Getty Images
American Mardy Fish, a former top-10 player, played his last match after losing to Feliciano Lopez in five sets. Clive Brunskill/Getty Images North America/Getty Images
Fish had missed most of the past two years due to a heart ailment and then anxiety. His final tournament could have been extended, since he served for the match in the fourth set. Clive Brunskill/Getty Images North America/Getty Images
Defending men's champion Marin Cilic moved into the third round by ousting qualifier Evgeny Donskoy in straight sets. Elsa/Getty Images North America/Getty Images
Despite needing treatment for a back injury, 2014 Wimbledon semifinalist Milos Raonic defeated Fernando Verdasco in four sets. Streeter Lecka/Getty Images North America/Getty Images
Raonic's fellow Canadian, Eugenie Bouchard, won a slugfest against Polona Hercog to record back-to-back wins for the first time since March. Streeter Lecka/Getty Images North America/Getty Images
With a big serve, Madison Keys -- a semifinalist at the Australian Open -- seems to have a bright future. The 20-year-old crushed Tereza Smitkova in the second round. Elsa/Getty Images North America/Getty Images
