It’s the semi-finals of the Dubai Duty Free Tennis Championships this evening, with the tournament blown wide open by the withdrawal of Novak Djokovic. The world number one was forced to retire from his semi-final match with Feliciano Lopez due to an eye infection. Lopez will face Marcos Baghdatis from 19:00, after Stanislas Wawrinka’s clash with Nick Kyrgios, which gets under way at around 17:00. French Open champion, Wawrinka, is expecting a tough test from the young Australian star…