Andy Murray has no qualms about Dani Vallverdu in Grigor Dimitrov’s camp

• Murray: ‘We went out for lunch the first day we got here’
• No2 seed flew to US Open from Cincinnati with VallverduAndy Murray’s hopes of winning a second US Open might have taken a minor hit during his three hours and 17 minutes struggle to overcome the awkward 34-year-old Italian Paulo Lorenzi, but he faces an altogether different sort of challenge against Grigor Dimitrov in the fourth round on Monday.There is the piquancy of Dani Vallverdu’s presence in the