CINCINNATI (USA) - Sara Errani made a winning debut in the doubles draw at the Cincinnati Open. The Romagna-born player, fresh from reaching the Toronto final alongside American Nicole Melichar-Martinez, has chosen to partner with Canadian Leylah Fernandez at the WTA 1000 event in Ohio. Errani and Fernandez defeated Germany's Tamara Korpatsch and Britain's Emily Webley-Smith 6-2, 7-6(2) in the first round. Errani changes partners after the Toronto final. The 39-year-old Italian, ranked number 9 in the world doubles ranking, arrives in Cincinnati with a new partner after her excellent run in Toronto. At…