Djokovic wins 6-1, 5-7, 6-2, 6-1! Fourth set: Djokovic 6-1, 5-7, 6-2, 6-1 Rune Djokovic wastes no time: forehand winner, ace, backhand winner, ace. He’s through to the second round and six wins from a record-setting 21st major title and the calendar-year grand slam. Fourth set: *Djokovic 6-1, 5-7, 6-2, 5-1 Rune (*denotes next server) Rune is able to get on the board in the fourth, holding at love with perhaps a bit of help from a passive Djokovic. Now the top seed will serve for a spot in the second round. Fourth set: Djokovic 6-1, 5-7, 6-2, 5-0 Rune* (*denotes next server) Djokovic holds at love, closing it out with an ace, a service winner and another ace. He’s one game from the finish line. Djokovic breaks in fourth game of fourth set! Fourth set: *Djokovic 6-1, 5-7, 6-2, 4-0 Rune (*denotes next server) Rune falls behind love-15, 15-30 then 30-40 on his serve. He saves a break point, then double-faults to give Djokovic a third. This time he converts with a forehand winner from the baseline and the match is but a handshake away. Fourth set: Djokovic 6-1, 5-7, 6-2, 3-0 Rune* (*denotes next server) Djokovic holds easily, punctuating the game with back-to-back aces of 108mph and 101mph. Djokovic breaks in second game of fourth set! Fourth set: *Djokovic 6-1, 5-7, 6-2, 2-0 Rune (*denotes next server) Rune is persisting on heart alone but the body is not complying as he falls behind 15-40 on his serve, pausing in between points in what appears to be agonizing pain. He’s able to save both break-point chances to push it to deuce, but Djokovic rattles off two quick points from there for the early break of serve. Fourth set: Djokovic 6-1, 5-7, 6-2, 1-0 Rune* (*denotes next server) Rune is back on the baseline and it appears he’s going to give it a go. But he’s not able to offer a whole lot of resistance as Djokovic breezes through his opening service game of the fourth. Djokovic wins third set, 6-2! Third set: Djokovic 6-1, 5-7, 6-2 Rune Rune falls behind 15-40 on his serve and appears to be in immense pain. Two break-point chances. He saves the first with a forehand winner, but double-faults on the next to gift Djokovic the break and the set. Not sure he will be able to continue. Meanwhile on the outer courts, Canada’s Vasek Pospisil has rallied for a 2-6, 3-6, 6-1, 6-3, 7-6 (4) win over Fabio Fognini. That’s the fourth fifth-set tiebreaker of the day. Third set: Djokovic 6-1, 5-7, 5-2 Rune* (*denotes next server) Djokovic double-faults to fall behind 15-30 on his serve, but answers with his fifth, sixth and seventh aces of the night – all down the center – to hold his serve. A suddenly hobbled Rune will serve to stay in the third set after the change of ends. Third set: *Djokovic 6-1, 5-7, 4-2 Rune (*denotes next server) Rune wins the first point on his serve, but he visibly appears to be struggling. The Dane rips a forehand winner on the next point for 30-love, then gets to 40-love when Djokovic nets a return. Djokovic gets a point back but Rune escapes with the hold thanks to a netcord winner from the baseline. Rune has called for a trainer during the changeover. He’s grabbing at his left leg and it appears he’s cramping up. A replay shows him wincing on a net approach during a point in the previous game. No medical timeout, only a brief consultation. Meanwhile, Djokovic has practically sprinted to his position on the baseline. Third set: Djokovic 6-1, 5-7, 4-1 Rune* (*denotes next server) Djokovic goes down love-15 on his serve but rattles off four quick points, including a 113mph ace down the middle, to back up the break. Djokovic breaks in fourth game of third set! Third set: *Djokovic 6-1, 5-7, 3-1 Rune (*denotes next server) Rune quickly falls behind love-40 on his serve. Three break chances for Djokovic. Rune saves the first with a crafty second serve that Djokovic can’t return in play, but Djokovic converts the second and he’s up an early break in the third. Third set: *Djokovic 6-1, 5-7, 1-1 Rune (*denotes next server) If you thought this youngster was going to shrink from the moment, it’s not happened yet. He answers with a straightforward hold that saw him outmuscle Djokovic over a 15-shot rally and crack his second ace of the night: a 126mph corker down the middle. Third set: Djokovic 6-1, 5-7, 1-0 Rune* (*denotes next server) They’re not saying “boo”, they’re saying Ruuune! The typically rollicking New York crowd is squarely in the young Dane’s corner, even cheering Djokovic’s double faults during critical moments of the second set. The world No 1 very much needs a drama-free service game to open this third set and that’s what he produces, racing out to 40-love then capping it with a 123mph ace down Broadway. Rune wins second set, 7-6 (5)! Second-set tiebreaker: Djokovic 5-7 Rune Djokovic saves the first with a 124mph service winner out wide, then the second with a 123mph thunderbolt down the middle that Rune can’t return in play. One more set point, this one on Rune’s serve ... and Rune’s second serve to the body catches Djokovic in an awkward position. The return sails long past the baseline and we’re level at one set apiece! Second-set tiebreaker: *Djokovic 3-6 Rune (*denotes next server) Another exhausting baseline rally is settled when Djokovic pounds a forehand winner from the baseline that Rune can’t reach. Rune to serve at 4-3. And he wins the first point with the cheekiest of drop-show winners from the back of the court. Wow. A well-placed 113mph serve that Djokovic can’t return into play gives Rune triple set point ... Second-set tiebreaker: *Djokovic 2-4 Rune (*denotes next server) Rune inches ahead 4-0, then misfires on a forehand to give Djokovic back a minibreak. A gruelling 17-shot rally ensues and it’s Rune who blinks, netting a forehand from the baseline. Rune still up a minibreak with the next serve on Djokovic’s racket as the players switch ends. Second-set tiebreaker: Djokovic 0-3 Rune* (*denotes next server) Rune cracks an overhand winner on his serve to open the proceedings. Then he gets the better of Djokovic over a 10-stroke baseline rally to go up a minibreak. Now Djokovic double-faults again – shocking! – and Rune is ahead three points to none with the next two serves on his racket. Second set: Djokovic 6-1, 6-6 Rune Djokovic opens his service game with an overhand winner, then follows with an unforced forehand error from the baseline for 15-all. A sharp backhand handcuffs Rune, then Djokovic smashes another overhand for 40-15. An inside-out forehand by Djokovic that Rune can’t return nails down the hold and we’re headed to a second-set tiebreak. Second set: *Djokovic 6-1, 5-6 Rune (*denotes next server) Easy hold for Rune, who caps it with an overhand winner into the corner followed by another running fist pump to the gassed-up Ashe masses. Djokovic will serve to force a second-set tiebreak. Second set: Djokovic 6-1, 5-5 Rune* (*denotes next server) Good golly! Another Djokovic double fault, his third in two service games, and he’s behind love-15 on his serve. He answers with back-to-back service winners – 118mph down the middle and 106mph out wide – but follows with a unforced error off the backhand for 30-all. He’s able to right the ship from there, getting the best of Rune in a 17-shot exchange then pounding a 126mph service winner. But it’s been anything but smooth sailing in this stanza for the Serb. Second set: *Djokovic 6-1, 4-5 Rune (*denotes next server) Rune breezes through his service game to back up the break, punctuating the hold with a fist pump to an Ashe crowd that’s very much in the underdog’s corner, and now Djokovic will serve to stay in the second set following the change of ends. Rune breaks in eighth game of second set! Second set: Djokovic 6-1, 4-4 Rune* (*denotes next server) A gorgeous forehand winner from the back of the court for Djokovic, but he follows it with his second double fault of the night for 15-all. Suddenly, a couple of loose points by Djokovic find him 15-40 down. Two break-point chances forthcoming. Djokovic saves the first when Rune badly misses a backhand. But Djokovic then double-faults again, gifting Rune the break. Back on serve in the second. Djokovic breaks in seventh game of second set! Second set: *Djokovic 6-1, 4-3 Rune (*denotes next server) Rune’s backhand continues to betray him as he quickly goes down 15-40 on his serve, giving Djokovic two more break-point chances. And he converts the first, catching his teenage foe in no-man’s land with a lob shot winner. Second set: Djokovic 6-1, 3-3 Rune* (*denotes next server) Djokovic opens with a 125mph ace down the T, then a forehand winner at the end of an 11-shot rally for 30-love. Another booming 122mph serve that Rune can’t handle makes it 40-love before Djokovic closes out the love hold to consolidate the break with a backhand volley winner. Djokovic breaks in fifth game of second set! Second set: *Djokovic 6-1, 2-3 Rune (*denotes next server) Rune falls behind love-30 on his serve, then makes his first double fault of the night for 15-40 and double break point. Djokovic wastes no time, cracking a forehand return winner to break and get back on serve in the second. Second set: Djokovic 6-1, 1-3 Rune* (*denotes next server) Djokovic’s scratchy start to this second set continues as he’s pushed to 30-all on his serve but he bites town with an unreturnable serve followed by a forehand winner from the baseline to get on the board. Second set: *Djokovic 6-1, 0-3 Rune (*denotes next server) Rune races out to 40-love on his serve, then closes out the love hold when Djokovic makes unforced error off the forehand. That’s 10 straight points for Rune and 12 of 14 in the second set overall. Rune breaks in second game of second set! Second set: Djokovic 6-1, 0-2 Rune* (*denotes next server) Djokovic falls behind 0-15 on his serve thanks to an unforced error off the backhand. Rune then hits a forehand passing winner for love-30 and gesticulates to the Ashe crowd, who respond with resounding cheers. What a time for Djokovic’s first double fault! Now he’s down love-40, giving Rune three break-point chances ... and he needs only one! Rune rips a forehand passing winner as his opponent rushes the net early in the rally and Djokovic is broken at love! Second set: *Djokovic 6-1, 0-1 Rune (*denotes next server) Rune is pushed to 30-all on his serve once again but this time serves his way out of trouble. Meanwhile on Grandstand, Petra Kvitova has made quick work of Polona Hercog, winning 6-1, 6-2 in 61 minutes. Djokovic wins first set, 6-1! First set: Djokovic 6-1 Rune Well, that was quick. Djokovic crushes his second, third and fourth aces in serving out the opening set in a stress-free 26 minutes. Djokovic breaks in sixth game of first set! First set: *Djokovic 5-1 Rune (*denotes next server) Rune is pushed to 30-all on his serve, then falls behind 30-40 after coming to net and watching Djokovic deliver a goregeous lob winner. A break-point chance and Djokovic calmly converts. Now the world No 1 will serve for the opening set. First set: Djokovic 4-1 Rune* (*denotes next server) Djokovic races out to 40-love, only for Rune to push it to 40-30 with a forehand winner and backhand passing shot the Serb can’t return in play. But before it can get uncomfortable, Djokovic rips a 119mph ace down the middle to secure the hold. First set: *Djokovic 3-1 Rune (*denotes next server) Rune is on the board after holding at love, helped along by three backhand unforced errors by Djokovic. Meanwhile on the outer courts, the 2011 US Open champion Sam Stosur is out following a 6-3, 6-0 defeat at the hands of Estonia’s Anett Kontaveit. First set: Djokovic 3-0 Rune* (*denotes next server) Djokovic falls behind love-15 on his serve but wins four quick points capped by a backhand volley winner for the elementary hold. Djokovic breaks in second game of first set! First set: *Djokovic 2-0 Rune (*denotes next server) Djokovic comes to net a couple of shots into a rally and hits a fully extended volley into the open court for love-15. The world No 1 comes to net again on the next point, but this time Rune passes him with a forehand for 15-all. Two quick points for Djokovic and very quickly he’s staked two early break-point chances. A lengthy 13-shot rally ensues and Djokovic blinks, sending a backhand astray for 30-40. Second break-point chance and Rune sends a forehand into the net to give Djokovic the early break. First set: Djokovic 1-0 Rune* (*denotes next server) Djokovic makes an unforced error off his backhand to fall behind on his serve, but rattles off three quick points for 40-15. Rune then pounces on a second serve, gets his teeth into the rally and rips a backhand winner for 40-30, but Djokovic nails down the hold on the next point with a big serve that Rune can’t return into the court. This time last year, the 18-year-old qualifier Holger Vitus Nodskov Rune was No 732 in the world. Now he’s ranked 145th, the first Danish qualifier in the US Open main draw since Kristian Pless in 2006 and facing Novak Djokovic under the lights of the world’s biggest tennis stadium. Life comes at you fast. They’re moments away from starting on Ashe. The night-session crowd is filing into Arthur Ashe Stadium as we speak ahead of tonight’s first prime-time match between top-seeded Novak Djokovic and Danish teenager Holger Vitus Nodskov Rune. The players should be taking the court for their warm-ups shortly after the top of the hour.