In men's competitions, top seed and world No.1 Novak Djokovic only dropped five games to cruise past lucky loser Daniel Elahi Galan of Colombia 6-0, 6-3, 6-2 to reach the last 16.
"It's funny. Both of us had a tough week in Hambug, tough final. Then both of us was down in the first round with two sets to love. Both of us come back. Now we are here and we're going to play each other in quarters. It's like a nice press story of the match," Rublev said about his quarterfinals match against Tsitsipas.
It was not the only stunning result of the weekend. Tottenham inflicted a humiliating 6-1 defeat on Manchester United at Old Trafford as the home side's defense imploded in a disastrous performance that Spurs exploited to the full.
With the result, Bayern Munich moves to the fourth position meanwhile Hertha Berlin suffered its second defeat to slip to the 13th position.
On the Dongguan side, Shen Yi nailed 13 points, while Hu Ke added 10.
Sunday's rivals are Europa League champions Sevilla, and Koeman's big issue is in defense thanks to the red card shown to Clement Lenglet against Celta on Thursday.
After both exchanged serves in the following two games, the former world No. 23 then delivered a dominant performance in the tie break to seal the first set.
Zhejiang had a advantage of five points in the first quarter, following a 15-1 pointing dash at the beginning of the second quarter.
"We haven't had an official game for quite a long time, thus leading to our huge anticipation towards it. All of us are excited about coming back on court," added China's national team center.
The South American zone's 2022 World Cup qualifiers had been scheduled to begin in late March but were postponed amid the escalating health crisis.
The 12th seed poured out his intense emotions on the court, yelling at himself or his coaches after wasting several chances.