David Nalbandian loses Queen's tennis final after injuring line judge
The Argentinian player had won the first set and was a break down in the second when he kicked out at an advertising board, which was placed directly in front of a linesman.
The linesman instantly screamed in pain and fell to the ground, revealing that he had been cut by the board.
Under official ATP rules, if a player causes injury to anyone on court through unsportsmanlike behaviour, they will instantly lose the match.
A few moments later, the umpire informed the crowd that Nalbandian's opponent Marin Cilic had won the match.
The result was met with a chorus of boos from the crowd, who seemed confused by what had happened and started a chant of "Play on".
Tournament organiser Chris Kermode told the BBC: "It is just one of things. In sport these things happen. It was an unbelievable final, the sun was out and it was shaping up to be the best match of the week.
"David Nalbandian ran across and in frustration kicked the panel out from under the line judge. It splintered and cut the linesman's leg, leaving him quite seriously injured. Rules are rules.
"The ATP forced us to end the final. David is struggling to come to terms with it. He is very sorry for what he has done."
Winner Cilic told Sue Barker on court: "I'm really sorry to the guys for this. To end like this is not easy. The match was getting hot and it's tough to see the final finishes like this. It's been a very good week and I've played some good tennis. I'm going to Wimbledon in good form and it has been great preparation."
While Nalbandian apologised to the crowd for what he had done, he was critical of the ATP's rules, saying: "I am sorry to do that. Sometimes we get very frustrated here on court. It is tough to control. Sometimes it is a mistake.
"It is a tough moment to end a final like that. Sometimes we feel the pressure from the ATP. It is a mistake and I have to pay for that. Everybody makes mistakes."
Tim Henman and Serena Williams have been among other players who have found themselves victims of the match forfeit rule in the past.