The National | ATP Dubai Duty Free Tennis Championships: Everything you need to know about the 2018 tournament The National World No 4 Grigor Dimitrov is the top seed for the 2018 Dubai Duty Free Tennis Championships. Koen Suyk / AFP. What is it? An ATP 500 tournament taking place in Dubai. Now in its 26th year. When is it? February 26 - March 3. Where is it? At the Dubai ... ATP Dubai - MAIN DRAW: Grigor Dimitrov and Lucas Pouille lead the field |