After the break, Union continued on the front foot and got their reward in the 49th minute when Marcus Ingvartsen had all the time and space at the edge of the box to slot home past Zentner into the far corner.
However, the 35-year-old Kipchoge was dropped from the leading pack with about three kilometers to go, finishing eighth at last.
"It was a very even match, perhaps more difficult than the result showed," said Djokovic, who is seeking for an 18th Grand Slam title.
Saturday ended with Newcastle United winning 3-1 at home to Burnley thanks to an excellent display from winger Allan Saint-Maximin. The Frenchman scored his side's first goal and then set up Callum Wilson for Newcastle's second of the game just four minutes after Ashley Westwood's 61st minute equalizer for the visitors.
Al Nassr broke the deadlock with a penalty in the 35th minute before Abdi Mehdi Qara leveled for Persepolis just six minutes later.
Hertha responded well and shocked the Bavarians with the equalizer as new arrival Jessic Ngankam scored his debut goal one minute after his substitution.
Last year "champion" Banska Bystrica (crowned after the abrupt end of the 2019/2020 season in March caused by the COVID-19 strike and subsequently stripped of the title as the governing body decided not to crown a champion of the shortened season) and the runner-up Slovan Bratislava are still trying to find their lost forms, losing their respective second-round fixtures.
Association president Fritz Keller demanded a series of victories to collect points helping to avoid relegation "as we can't afford to go down to a lower group."
Burel wasted three set points when she took a 5-3 lead in the first set and stormed to 40-0 in the ninth game. But Zhang battled back to save all three, and held the serve before breaking Burel's in the tenth to level the score at 5-5.
The 19-year-old will face another qualifier -- Nadia Podoroska of Argentina in the semifinals. The latter stunned third-seeded Elina Svitolina 6-2, 6-4 to advance. Enditem
Struber joins the Red Bulls from English Championship side Barnsley, where he's been since November 2019. The Red Bulls paid an undisclosed fee to Barnsley to release him from his contract.