Kei Nishikori and Agnieszka Radwanska can make history, but the odds are against them.
Zhang Shuai breaks a long losing streak with a stunning performance at the Australian Open.
Roberta Vinci or Flavia Pennetta will be the nation's first Grand Slam champion outside of the French Open.
Flavia Pennetta is into her second U.S. Open semifinal in three years as the No. 26 seed.
Danielle Rose Collins takes the first set from No. 2 seed Simona Halep at the U.S. Open, but that is the highlight for the Virginia Cavalier.
Simona Halep credits her meteoric ascent up the charts to this 2009 procedure.