Tennis
Top seeded Sharapova, Errani and Djokovic advance at U.S. Open and Murray battles to reach the semifinals.
Rain on Tuesday forced U.S. Open officials to cancel or postpone quarterfinal matches until Wednesday.
Labor Day matches saw three key players advance to the next round and a major upset by No. 20-ranked Roberta Vinci over No. 2-ranked Agnieszka Radwanska.
Sunday saw victories from Djokovic, Roddick, Ferrer, Sharapova and Azarenka as Isner is upset by Kohlschreiber.
While most of the top-seeded players breezed through their matches, Andy Murray faced some challenges before advancing to the next round.
Friday's matches saw major players advance to their third and fourth rounds and another major upset by 18-year-old Laura Robson.
The No. 20-ranked American Andy Roddick announced on Thursday that he would be retiring after the tournament.
Laura Robson beat No. 23-ranked Kim Clijsters for the biggest upset of this year's Open.
The high-profiled players, who didn't allow for any upsets during their first matches, geared up for a second round of the games.
The No. 1-ranked Swiss called No. 2-ranked Novak Djokovic a favorite for the title, shortly after surpassing American Donald Young on Monday.