By Harry Davies Francis Ngannou left presenter Olivia Buzaglo red-faced with an X-rated response to her question about Anthony Joshua. Ex-UFC heavyweight champion Ngannou fights for the second time as a professional boxer when he faces Joshua on Friday in Saudi Arabia. The Cameroonian put on a performance for the ages in his ring debut last October when he dropped Tyson Fury and only lost by a single point in a controversial decision. Ngannou got in the ring this evening to show off a selection of skills at an open workout in Riyadh. DAZN presenter Buzaglo then asked him: “Are you going to sta…