Andy Murray was so incensed by the “erratic” grunting coming from the other end of the court last night that at one point he shouted “outrageous”.
The British number one was in action at the BNP Paribas Open in Indian Wells against Argentine Carlos Berlocq and would go through to the quarter-finals 7-6 6-4. However, Murray grew increasingly frustrated as the match went on with the noises emanating from his opponent.
"It was extremely, extremely loud, more than what I have experienced from any other player on the tour," Murray said after the match.
Murray, who will play Juan Martin Del Potro in the next round, appeared to hint at gamesmanship from his opponent.
"It's like sometimes silence and then it comes out of nowhere. It's a bit of a shock.
"That's what I don't understand. To go from nothing to the loudest grunt you can do. It makes no sense."
Murray raised the issue with the umpire after his opponent had made a complaint about the Scotsman taking too long between points.
"When I have been on the court or off it, it's never been something I have found to be really that off-putting," said Murray.
"But if it's going to be suggested that I am using gamesmanship by taking too long, then you can't be making noises like that on the court. I haven't experienced it like that before."