Once Federer and Nadal reach the final, anything can happen.
'I speak with him every day, he told me that he is doing well.
MEN'S 4TH ROUND MATCH-UPS: Roger Federer (No.1 seed, SUI) vs Adrian Mannarino (22nd seed, FRA); Gael Monfils (FRA) vs Kevin Anderson (8th seed, RSA); Mackenzie McDonald (USA) vs Milos Raonic (13th seed, CAN); John Isner (9th seed, USA) vs Stefanos Tsitsipas (31st seed, GRE); Karen Khachanov (RUS) vs Novak Djokovic (12th seed, SRB); Kei Nishikori (JPN) vs Ernest Gulbis (qualifier, LAT); Juan Martin Del Potro (5th seed, ARG) vs Giles Simon (FRA); Jiri Vesely (CZE) vs Rafael Nadal (2nd seed, ESP).
"I just tried to do something different; go out there first point, second serve, just tried to dictate and come in", he said.
Nadal has also impressed in SW19, however, and will win his 18th Grand Slam if he comes out on top at the All England Club. I know on the women´s side more so.
"But at the end I felt like it was just a couple games, my service games, long games where I wasn't able to quite finish it off. I didn't feel the effect this time".
Meghan Markle and Prince Harry's post-wedding thank-you cards revealed
Harry was made the Commonwealth Youth Ambassador by Her Maj earlier this year as she started stepping back from her involvement.
Nine of the top 16 seeds in the men's draw were eliminated in the first three rounds, and the carnage is even worse in the women's draw, as one of the top 10 seeds remains in contention entering the second week.
The French Open champion looked like she would escape with a match point at 5-3 in the third, but Hsieh rallied to break again and run away with victory.
Nadal, Djokovic and Federerboast 49 grand slam singles titles between them and few would bet on that figure reaching 50 come next Sunday.
"Every single match I play, whether I´m coming back from a baby or surgery, it doesn't matter, these young ladies, they bring a game that I´ve never seen before. I am not stupid", world number one Nadal said on Saturday to hoots of laughter from reporters. She was the unlucky player to miss out on a seeding when Serena Williams was handed No 25, but the world No 32 has channelled that frustration in supreme style, brushing aside home favourite Johanna Konta and 15th seed Elise Mertens - both in straight sets.
"That's what makes me great: I always play everyone at their greatest, so I have to be greater".
The Czech faces Dutch 20th seed Kiki Bertens, who stunned five-time Wimbledon victor Venus in the third round.