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U.S. Open 2018 Live Updates: Sloane Stephens and John Isner Lose

• Sloane Stephens, the defending champion, lost in the quarterfinals to Anastasija Sevastova on Tuesday at the U.S. Open.

• The top American on the men’s side, No. 11 John Isner, also fell, losing to No. 3 Juan Martín del Potro.

Refresh here for live results and analysis from Day 8 of the 2018 U.S. Open

• Live scores and schedule: Men | Women

Juan Martin del Potro reached the U.S. Open semifinals for the second year in a row.

How to watch: Matches will be streamed on ESPN3 and ESPN+ beginning at 11 a.