A Wimbledon-record five men older than 30 will play in the quarter-finals, led by 35-year-old Roger Federer, who is bidding for a record eighth title at the All England Club.
Federer's opponent is Milos Raonic — the third time in four years they will face each other at the tournament. Federer beat Raonic in the 2014 semi-finals, then lost to him in last year's semi-finals.
"Roger's been the best player, I think, this year, hands down, when he's been on court," said the sixth-seeded Raonic, a Canadian who was the 2016 runner-up to Andy Murray at Wimbledon.
"But it's not about six months or whatnot. It comes down to Wednesday, one day, so I've just got to try to find a way to try to be better on that day."
The Federer-Raonic winner will take on either three-time champion Novak Djokovic, 30, or 2010 runner-up Tomas Berdych, 31, in the semi-finals.
Djokovic, who owns a 25-2 career record against Berdych, had a trainer massage his right shoulder during his fourth-round win, so it will be important to see how that part of his body holds up in the quarter-finals.
On the other half of the draw, two-time champion Murray, 30, plays 24th-seeded American Sam Querrey, who has never been to a major semi-final.
Murray will retain his world number one ranking if he defeats Querrey, the man who ended Djokovic's run as champion in 2016.
Murray is bidding to make his eighth Wimbledon semi-final in the last nine years and is playing in his 10th straight quarter-final at the tournament.
The other quarter-final is 2014 US Open champion Marin Cilic against 16th-seeded Gilles Muller, 34, who stunned Rafael Nadal 15-13 in the fifth set of a fourth-round marathon that lasted more than four and a half hours.
Cilic has lost in the last-eight in each of the last three years -– falling to Djokovic in 2014 and 2015, and to Federer in five-sets last year despite holding a 2-0 lead.
Take a look at the Order of Play for Day 9 at Wimbledon:
Centre Court (1:00pm/1200 GMT)
Andy Murray (GBR x1) v Sam Querrey (USA x24)
Milos Raonic (CAN x6) v Roger Federer (SUI x3)
Court One (1:00pm/1200 GMT)
Gilles Muller (LUX x16) v Marin Cilic (CRO x7)
Tomas Berdych (CZE x11) v Novak Djokovic (SRB x2)
With inputs from agencies
Published Date: Jul 12, 2017 11:00 pm | Updated Date: Jul 13, 2017 12:10 am