Novak Djokovic accused a Wimbledon official of not knowing the tournament’s rules in a row over closing the roof during his clash with Felix Auger-Aliassime.A frustrated Djokovic was caught in a tense exchange with referee Denise Parnell following the controversial decision to shut the roof on Centre Court.Djokovic’s dream of a 25th Grand Slam title is still alive after a late-night marathon-match victory to set up a blockbuster semi-final showdown with Wimbledon top seed Jannik Sinner. Auger-Aliassime had levelled the match at one set all when Wimbledon chiefs made the call nearly two hours before sunset. The Canadian world No 4 was also in favour of keeping the roof open.And Djokovic was spotted protesting to Parnell before the start of the third set in a terse discussion that was caught by TV cameras.’Why now? The other day you didn’t want to close it until like 8.30 but now you want to close it?’ The 24-time Grand Slam champion fumed. Novak Djokovic was spotted in a tense exchange with a Wimbledon official over the closure of the roof in his match against Felix Auger-Aliassime’You don’t want to get to 8.30? It’s 7.40 now, we could play a whole new set in that time. ‘I don’t care what happened with other matches – I’m talking about now. In the first round you didn’t close it until like 8.20 and now you want to close it at 7.40? Where’s the consistency?’You guys are so proud of your rules and you’re not sticking to any kind of rules. We have no idea what the rule is. This is an outdoor tournament.’ On Tuesday, sunset was officially recorded at 9.17pm in London – nearly two hours after Wimbledon officials decided to close the roof. Djokovic, bidding to win a record-equalling eighth Wimbledon title, was backed by former world No 1 Lleyton Hewitt. ‘Rightly so, you can play another set in 40 minutes,’ said Hewitt. ‘Novak is right, every other night they’ve played to a certain point.’ Centre Court witnessed the longest quarter-final in SW19 history, a five-hour slugfest involving the big serving of Auger-Aliassime against one of the game’s greatest returners. It was only via a fifth-set 10-point tiebreak that precision finally trumped power, with Djokovic triumphing 10-4 to confirm a 7-6, 3-6, 6-3, 6-7, 7-6 victory.You had to rewind to 2006 and against Mario Ancic to find the last time Djokovic lost a match at Wimbledon after leading by two sets to one. That record remains intact, though this was a lengthy contest fraught with complications which the 39-year-old Serbian could have done without in his pursuit of Grand Slam No 25.Sinner, 24, had strolled to a straight-sets win over Jan-Lennard Struff earlier in the day before telling the media he would spend his evening watching his potential semi-final opponents in Djokovic and Auger-Aliassime. Djokovic earned a marathon five-set win to keep alive his dream of a 25th Grand Slam titleThere, Sinner saw Djokovic suffer a lower-leg injury after only nine games. The seven-time SW19 champion overcame that niggle, but not Auger-Aliassime’s refusal to allow him to wrap up this win as he sent us into a deciding set and tiebreak, where Djokovic prevailed just six minutes before Wimbledon’s 11pm curfew.It was with a dance for Centre Court that Djokovic celebrated an exhilarating, and exhausting, victory.’These are the moments that I still play tennis for,’ he said. ‘I wish it was the final so that I don’t have to worry about how my body will feel tomorrow. But I’m happy. It was honestly one of the best matches I’ve been a part of on this court. ‘I have no energy left. I have to recover, I’m still in the tournament, and I have the best player in the world in two days’ time.’ Serbian star Djokovic, 39, had earlier been fined £5,600 by Wimbledon bosses for an ‘audible obscenity’.The exact incident has not been revealed but Djokovic was heard shouting ‘bulls***’ and swearing in Serbian during his win over Roman Safiullin in the last 16.