The evergreen Swiss looks well on course to defend his title and claim a staggering ninth win on the famous grass courts in West London, with Rafael Nadal seemingly the only man capable of stopping him.
Hsieh's protests to the umpire prompted the match referee to come on court to intervene as the argument lasted over seven minutes before the point was finally replayed, much to Cibulkova's disgust.
He managed to finish off Russia's Karen Khachanov in straight sets in the gathering gloom on Monday.
After seven minutes, the decision was finally changed and the point replayed.
On Monday, he nearly fell victim to the scheduling curse again.More news: Microsoft's Entry Level Tablet Arrives in August for $399 — Surface Go
"Well, it's going to happen anyway, if I'm going in the final or not, the Wimbledon final will take place, and so will the World Cup final", Federer said.
Bizarrely, organisers made a decision to put a mixed doubles match on Centre Court, which was concluded under the roof after sunset.
"Like past year, I received the information that they can't reschedule my match on the other court because of the tickets that are presold". Even if I played, I was not able to compete with the knees the way I had. From my point of view, it's a very exciting quarter-final line-up in the men. "It's always a big challenge", said Nishikori, who has beaten the Serb just twice in 15 meetings.
The 36-year-old is also on a streak of 32 consecutive sets won at the tournament, just two off his record.
McDonald began the year earning $780 for losing to the world No 145 Uladzimir Ignatik in the first round of a minor tournament in Playford, South Australia - and three weeks later was taking the world No 3, Grigor Dimitrov, to five sets in the second round of the Australian Open.
The world number two has also now not dropped serve since the semi-finals past year.More news: Divers go in to save all remaining Thai boys trapped in cave
The top-ranked player in Greece (a career high No. 35), Tsitsipas is hardly alone in studying Federer for tips.
Kei Nishikori - Nick Kyrgios's third-round vanquisher - also marched through, the Japanese superstar stopping fatiguing Latvian qualifier Ernests Gulbis 4-6 7-6 (7-5) 7-6 (12-10) 6-1 to make his first Wimbledon quarter final.
Del Potro leads Simon 7-6 (1), 7-6 (5), 5-7, 0-0.
When asked if he was anxious about Sunday's World Cup final in Russian Federation clashing with the Wimbledon men's singles final, Roger Federer couldn't help but laugh.
"Roger wants to get to 21, Rafa wants to get to 18, Djokovic wants to get to 13 to get into the mix again so lots of storylines".More news: Is Modric the best midfielder in the world?
"But if you ask me if I prefer another one, I say yes".
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