Andy Murray’s elbow still a worry as he prepares for Monte Carlo Open

• British No1 gets first chance to test injury under match pressure
• Scot missed Miami Open and Britain’s Davis Cup defeat in FranceAndy Murray picks up a racket in public for the first time in nearly a month in Zurich on Monday night when he plays an exhibition match against Roger Federer that will raise money for underprivileged schoolchildren in Africa but will tell the Scot little about the state of his worrisome right elbow.Murray, who missed the Miami Open last week and Gr