Austria's Jurgen Melzer says beating his younger brother Gerald in the first round of Wimbledon qualifying was "the worst tennis day" of his life.
Former world number eight Jurgen, 34, beat his 24-year-old sibling 6-1 6-4 to move into the next stage.
"It was not fun at all. I hope we will never play each other again," he said.
"Some people like to compete against family and we do when we play cards or video games, but it's not the same thing when it's a tournament match."
The brothers had never met at professional level before Monday's qualifier at Roehampton.
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Jurgen, who was a French Open semi-finalist in 2010, reached the last 16 at Wimbledon in 2010 and 2013. But he has fallen to 131 in the world rankings after being hampered by a shoulder injury over the past 18 months.
Gerald is ranked 169 in the world and was attempting to make the main Wimbledon draw for the first time.
"Neither of us were happy to see the draw," added Gerald.
"We had a good practice and were looking forward to playing at Wimbledon, but it's not the kind of match you'd want to play twice."