WASHINGTON — Venus Williams took the Mubadala Citi DC Open by storm.

Venus Williams just came back from a 16-month break from professional tennis. But she didn’t return because she missed playing — rather, she missed her health insurance. “I had to come back for the insurance,” Williams, 45, said this week after beating Peyton Stearns — 22 years her junior — at the Mubadala Citi DC Open in Washington, D.C.

Venus Williams became the second-oldest woman to win a tour-level singles match in professional tennis, delivering some of her familiar big serves and groundstrokes at age 45 while beating Peyton Stearns — 22 years her junior — by a 6-3, 6-4 score at the DC Open on Tuesday night.