Djokovic loses world number one ranking to Medvedev

Novak Djokovic lost his Dubai quarter-final and his world number one ranking in one go on Thursday as he suffered a 6-4, 7-6 (7/4) upset at the hands of Czech world number 123 Jiri Vesely. Competing in his first tournament of the season, and first since getting deported from Australia, Djokovic needed to at least…