Djokovic vs. Bu: who pays for the slow court

Novak Djokovic and Bu Yunchaokete meet for the first time in their careers, in the China Open second round, evening session on the Diamond Court. The variable that decides this match is the average rally length. Bu needs short points to stay in it, and Beijing is the wrong place to look for them: the courts at the National Tennis Center are among the slowest on tour and the balls are HEAD, the one Asian stop that hasn't switched to the livelier Yonex used in Tokyo, Chengdu and Shanghai. Every extra rally, though, goes onto Djokovic's physical bill: in the first round he called the physio at 2-3 in the second set.

Bu's serve pays less here than elsewhere

Against Juan Manuel Cerundolo, Bu won with the numbers of his best tennis: 11 aces, 65% of first serves in, 84% of points won behind the first ball, thirteen service games held out of fifteen. It still took him two hours and nineteen minutes to close out 6-2, 5-7, 6-4.

The number that matters going in is that time. With serving like that the match still went past two hours, because here the court doesn't close out points for you. And conditions get worse at night, with the humidity slowing the ball down further.

Bu is an aggressive hard-court baseliner who looks to take charge of the rally with the first forehand after the serve. On this surface that first forehand arrives on a ball that bounces higher and travels less, and on the other side there's Djokovic's return, which on a court like this lives on exactly that. Bu's serve+1 risks becoming the first shot of a seven-ball rally rather than the last of a three-ball one.

Djokovic's physical bill

Djokovic beat Nuno Borges 6-3, 7-6(2) in one hour and fifty-one minutes, saving both break points he faced and running away at 5-1 in the tie-break. In between, a medical timeout in the second set, for a problem the reports put down to his back.

"In the second set he started playing better and I struggled physically to stay fresh,"

he said, at 39 years old.

It was his first win since Wimbledon, since the quarterfinal he won in five sets over Félix Auger-Aliassime. From there on: a semifinal lost to Sinner, a defeat in Cincinnati to Thiago Agustín Tirante, a first-round US Open loss in five sets to Mariano Navone. Eleventh in the rankings, zero titles in 2026.

The 30-0 in Beijing and the six titles carry weight, at a tournament he hadn't played since 2015. He pointed out the technical lever himself after Borges:

"Getting first serves in, that high percentage makes my life easier."

It means short points in his own service games, because on a court this slow it's the return games that cost legs, and the legs right now are a resource on a clock.

What Bu has already done in this stadium

In 2024, as a wild card, Bu reached the Beijing semifinal beating Zizou Bergs, Shang Juncheng and Andrey Rublev, the first Chinese man to do it at this tournament, and lost to Sinner 3-6, 6-7(3). In September, into the US Open draw as a lucky loser and ranked No. 124 in the world, he dismantled the twelfth seed Rafael Jodar 6-2, 6-1, 6-1 without conceding a single break point, pushing him into 36 unforced errors.

The context cools the picture. That win over Jodar was his first at ATP level in all of 2026: Bu's season has been a Challenger season, with finals lost in Wuxi and Busan. And he comes into this match with four matches in his legs inside a week, from September 24 to 30, between Hangzhou and the first round here. Freshness isn't an advantage on this side of the net either, then.

Djokovic starts a clear favourite and the call is straight sets, with the match decided inside the first eight games. Bu's road to the upset runs through the clock: he has to take it past two and a half hours, holding serve at the percentages he produced against Cerundolo and stretching the rallies when he returns, with the home stadium making noise in the long games.

The falsification condition is measurable in the first set already. If Djokovic stays around 40% of first serves in, as in the early games against Borges, and the set goes to a tie-break, the body comes back to the foreground and the slow court starts working against him. If the first serve lands and the first set closes inside forty minutes, the number to write down is 31-0.