Andy Murray secured his 500th ATP Tour victory but he was made to fight for his landmark win by big-serving Kevin Anderson in Miami.
No British player has ever achieved the milestone mark with Tim Henman ending his career just four short.
Since tennis went open in 1968, when the old distinctions between amateur and professional players were erased, only 45 men have clocked that many wins and only nine who are currently active have managed it.
And the British number one joins a group of just 16 players to have achieved the feat aged 27 and under, alongside legends like Bjorn Borg, Roger Federer, John McEnroe and Boris Becker.
Murray is a keen student of tennis history and also takes his time to study stats but was really pushed by Anderson, who rallied after losing the first set to make the match close.
But the world number four - who beat the South African at Wimbledon last year - finally secured his last eight progress 6-4 3-6 6-3.
"It means a lot to reach 500 wins, there aren't a whole lot of people who have done it and it's very nice to have achieved it, especially here in Miami where I've had a lot of success," said Murray, who was presented with a giant cake to mark his achievement.
"I just hope it's not the last match I win. I hope there's a few more in my career. There's a certain number I'd like to get to before I finish playing and hopefully my body can hold out."
Murray, a two-time winner in Miami, will now play rising star Dominic Thiem in the quarter-finals, following his victory earlier in the day over Adrian Mannarino.
"I expect another tough match, he's had some good wins here this week and made some big improvements last year. He struggled a bit earlier this year but he obviously likes the conditions in Miami," he added.
"I practice with him quite a bit and he's a nice guy with a big future and it won't be easy."
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