Some sad news today. We’re hearing that tennis star Serena Williams has underwent an “emergency treatment” to remove a blod clot found in her lungs. Let’s keep Serena lifted up in our prayers.

Spokeswoman Nicole Chabot told the magazine that Williams “underwent emergency treatment for a hematoma suffered as a result of treatment for a more critical situation.”

Williams suffered from a pulmonary embolism last week, Chabot said. The 29-year-old Williams is being treated at a Los Angeles hospital.

“Doctors are continuing to monitor her situation closely to avoid additional complications,” Chabot told the magazine.

The winner of 13 Grand Slam titles, Williams attended Sunday night’s Elton John AIDS Foundation Academy Awards Viewing Party.

On Tuesday night, Williams posted on her Twitter account “Tough day.” A few minutes later she retweeted Kim Kardashian.