In a scenario that some will find frustratingly familiar, Emma Raducanu retired from her opening match in Doha after having her blood pressure checked by the doctor. It was a surprise, in some ways, that Raducanu even took the court for this meeting with qualifier Camila Osorio. She had looked thoroughly exhausted while playing the final – her first in five years – in Cluj-Napoca on Saturday, and was then only able to take one day off between events. Although Raducanu played some solid percentage tennis to claim the opening set – the first set she has ever won in three visits to Doha – her energy levels seemed to fall away as Osorio broke her serve midway through the second and then hung on to set up a decider. Few would have backed Raducanu to come through a test of stamina, and indeed she dropped serve again immediately before being visited by the doctor. Although she returned to the court for one last Osorio service game, she was barely moving as a series of …