Less than a week following her remarkable 21st Grand Slam title win at the 2015 edition of the Wimbledon Championships, Serena Williams has withdrawn from the Swedish Open in Bastad after sustaining an elbow injury during a practice session.

The decision to withdraw took place after Williams had already won her opening match in Bastad. The following day, she withdrew after sustaining the elbow injury while training on a practice court.

Swedish Open officials, who scheduled a press conference for the American to explain what occurred, later announced the news.

“I was having some pain in my elbow, and I felt it a little bit in my match,” Williams said. ““But this morning it really exploded [in practice]. I really couldn’t hit serves.”

“I always enjoy my time here. I have such a great time. My fans here are really amazing, I love all you guys,”

Williams’ Serena Slam consists of consecutive Grand Slam title wins from the 2014 United States Open up until her Wimbledon 2015 title. If she can defend her US Open title, she will have completed the Calendar Grand Slam. She is also the oldest woman to ever win a Grand Slam title. Most impressive of all, this was Williams’ 21 Major title, which puts her one behind Steffi Graf’s Open Era record of 22 titles.