John Isner, who suffered a knee injury in the second round of Wimbledon that forced him to retire from his match, says he’s now feeling better. Isner hurt his knee while coming down from a serve.

“What happened at Wimbledon was really bizarre,” told the Providence Journal. “It’s unfortunate that it happened, but it’s fortunate that it was nothing serious.”

Isner faced his friend Ryan Harrison fourth time this season in Newport, with Isner winning 7-6 (0), 6-2. Isner has won three out of their four meetings.

The 21-year-old Harrison’s ranking has dipped to No. 110, well off his career high of No. 43 that he established one year ago.