LOS ANGELES — Serena Williams tells USA Today that she’s “at the end of (her) rope’’ after several physical setbacks that have kept her off the court since July.

In an interview published in Wednesday’s edition, Williams says it has been a “tough year.’’

Shortly after her fourth Wimbledon title, Williams cut her foot on some broken glass at a restaurant – resulting in a pair of surgeries. Then last month, she suffered a pulmonary embolism and was hospitalized to remove a grapefruit-sized hemotoma from her stomach.

The 29-year-old says she was “definitely depressed’’ after the second foot surgery: “I cried all the time. I was miserable to be around.’’

The former No. 1 player in the world insists she’s determined to return to the dominant form that led her to 13 Grand Slam singles titles.