Sheffield’s Marray began playing with Brown at the French Open in 2012 and the pair enjoyed a successful partnership, reaching four Challenger finals and winning two in Bosnia and Italy.
Brown has since turned his attention back to singles and the 30-year-old inflicted the biggest shock at Wimbledon so far on Thursday night when he dumped out two-time champion Nadal in the second round.
The stunning victory marks a remarkable rise from the days when Brown used to travel to tournaments in a camper-van and strung other players’ rackets to save money.
A full head of dreadlocks, which he has not cut since he was 19, and an explosive style of play have both caught the public’s imagination and Marray admits even when they played together, he never knew what was coming next.
“I don’t think he even knows what he’s doing himself half the time,” Marray said. “I didn’t really know what he was doing when I played with him. It was like playing against him, you never knew what was coming.
“He played ridiculous shots out of nowhere, angled winners off anything. It was good fun to play with but not such good fun to play against.
“He’s totally unpredictable. With most people you have an idea of what they like to do and where their strengths are, but with Dustin it’s hard to predict what’s coming. It’s hard to formulate a plan against him.
“The number of times I played with him and he turned a match in a few points with ridiculous shots. He was great fun to play with and he’s a good guy.”
“I didn’t play that much with him during his camper-van stint but when I played with him he talked about that,” Marray said.