WASHINGTON (AP) — Competing at a tournament for the first time in more than a year, and in doubles for the first time in nearly three, Venus Williams hit a big serve on her initial delivery at the DC Open on Monday and, curiously, it was wiped out by a foot-fault call.

Seven-time Grand Slam single champion Venus Williams returned to competitive tennis after a 16-month hiatus on Monday with a doubles victory at the WTA and ATP DC Open.

Naturally, Venus Williams’ return to competitive tennis at the DC Open has sparked questions about whether her sister Serena might, too.