WASHINGTON -Former world number one Venus Williams will make her singles comeback after nearly a year at the Citi Open in Washington, D.C. that begins next week, organisers said on Thursday. The seven-time Grand Slam champion accepted a wildcard for the July 30-Aug. 7 WTA 250 event a day after announcing she will also compete at next month’s WTA 1000 event in Toronto, where she will be joined by her sister Serena.