“It's not a focus for just Wimbledon,” Raonic explained. “It's John coming along to help me improve in general. I want to improve at coming forward and I want to improve at putting more pressure on my opponents.

“If you see great volleyers, most of the time the volleys are pretty easy and it's because of positioning. It's those things that I want to [improve], those instincts where I put myself in the court, how I position myself.”

Raonic is hugely ambitious, an analytical character who questions everything he does in practice. Over the last couple of years he has invested in coaching, hiring the Italian guru Riccardo Piatti to work on his technique, and a couple of former top-ten players – first Ivan Ljubicic and now Carlos Moya – to help him plot his route through grand slams.