LONDON (AP) — Serena Williams is back on a professional tennis court.

The 44-year-old Williams was given a standing ovation as she walked onto the grass court at Queen’s Club on Tuesday for her first-round doubles match together with 19-year-old Canadian Victoria Mboko. They were playing third-seeded duo Nicole Melichar-Martinez and Erin Routliffe in Williams’ first professional match in nearly four years, after the American last week announced her return to doubles.