Emma Raducanu says she was fighting against jet-lag during her three-set 6-2 3-6 6-4 opening round victory against Elise Mertens at the Mubadala City DC Open in Washington.
The 21-year-old, in her first appearance since a Wimbledon last-16 defeat earlier this month, won five straight games to take the first set but Mertens, the eighth-seeded Belgian, responded well…