Novak Djokovic surpassed Roger Federer for the most men’s singles match wins in Wimbledon history by booking a quarter-final place with a testing four-set victory over Russian qualifier Roman Safiullin. The seven-time champion has never lost a grand slam contest to a player ranked as low as world number 132, but a monumental upset briefly loomed when he faced two set points at 5-3 down in the opener.