From Roger Federer’s record eight titles to Novak Djokovic’s domination as he won three consecutive times from 2009-2011, the Dubai Duty Free Tennis Championships have long proved a popular stomping ground for former champions. And that tradition will continue this month as a quartet of previous men’s winners prepare to compete in the emirate once more. From February 23-28, Daniil Medvedev, Andrey Rublev, Ugo Humbert, and Stefanos Tsitsipas will all feature in Dubai, promising a mix of elite competition, dramatic storylines, and the unmistakable glamour that has made the ATP 500 event a highlight on the men’s calendar. Coming one week after the city’s WTA 1000 tournament features all the...