Trio of Americans Into Citi Open Quarterfinals
For the first time since 2012, three Americans find themselves in the quarterfinals of the Citi Open in Washington, D.C, as eighth-seed John Isner, 15th-seeded Jack Sock and unseeded Steve Johnson all won their third round matches on Thursday. The most surprising victory of the three came from the unseeded Johnson, who upended sixth-seeded Bulgarian…

