Wild card Caroline Wozniacki, another former champion and returning mother, will play 20th seed Magda Linette.
The United States justified their status as favourites to outclass Italy in a one-sided final at the inaugural United Cup mixed team tournament on Sunday.
Novak Djokovic's bid for a record 25th Grand Slam title kicked off on Monday with an easy win over qualifier Radu Albot in the US Open first round.
18-year-old Carlos Alcaraz of Spain became the youngest to clinch an ATP 500 title at the same event on Sunday when he defeated Diego Schwartzman in the final of the Rio Open.
Factbox on Carlos Alcaraz, who beat seven-time champion Novak Djokovic
'He told me that (I had) a great run, and I told him again, 'bravo'.'
Galan will play either Canadian Denis Shapovalov or American Brandon Nakashima for a place in the fourth round.
Images from Day 4 of the 2023 Wimbledon Championships.
IMAGES from Day 1 of the Wimbledon Championships, at the All England Lawn Tennis and Croquet Club, London, on Monday.
Sweden's Elias Ymer replaced Berrettini in the men's draw, organisers said.
Former world number one Andy Murray looked back to his best on grass as he beat Nick Kyrgios 7-6(5), 6-2 to move into the final of the Stuttgart Open on Saturday after the Australian lost his cool in the second set and said he was racially abused by a fan.
'Rafael Nadal withdrew for personal reasons'
Britain battled to victory over last year's Davis Cup runners-up Australia in their Finals group stage opener on Wednesday, while Spain and Italy both suffered chastening defeats at home in the premier men's team competition.
Novak Djokovic will begin his quest for a record-extending 10th Australian Open title against Roberto Carballes Baena.
Novak Djokovic ruthlessly took Matteo Berrettini apart at the ATP Finals on Sunday as he began his quest to reclaim the number one ranking by winning his opening group match 6-2, 6-1.
Matteo Berrettini won the Stuttgart Open for a second time after he beat Andy Murray 6-4, 5-7, 6-3 on Sunday to deny the Scot what would have been his first title on grass in six years.
Monfils, 35, reached the last four at the 2008 French Open and repeated the feat eight years later at the 2016 US Open but has never reached a Grand Slam final.
The major milestones in Djokovic's career
In the decider, Berrettini broke twice for a 4-2 lead but a rejuvenated Monfils dug deep and raced around the court to fight off three match points to force a final-set tiebreak. But it was Berrettini who leaned on his powerful serve to prevail and become the fourth Italian man to reach a Grand Slam semi-final in the Open Era.
His third straight triumph at the All England Club also earned the Serbian a 20th Grand Slam title
Sinner is most likely to upset the applecart after the Italian's run to the Canadian Open title this month
Roger Federer got back on track at the ATP Finals with a 7-6(2), 6-3 defeat of Italian Matteo Berrettini on Tuesday.
Sinner has made the most of a favourable draw at the grasscourt major this year
Images from Day 2 of the 2023 Australian Open at Melbourne Park on Tuesday.
Thiem had already sealed a place in the semi-finals after group wins against Roger Federer and Novak Djokovic, while Berrettini could not progress.
The big-serving seventh seed, who has flown somewhat under the radar throughout the Championships, will meet the winner of the second semi-final between Serbia's Novak Djokovic and Canadia's Denis Shapovalov in Sunday's final.
Russian Andrey Rublev has become the fifth singles player to qualify for the season-ending ATP Finals in Turin next month, the men's tour said.
Andy Murray said he remains on course to play at Wimbledon even though he is still being hampered by an abdominal injury
Nadal was the favourite and top seed having lifted the Barcelona Open trophy last month but played below par on a sweltering spring day.
The 34-year-old bellowed a series of frightening roars after completing a victory that at one stage looked like a formality but became increasingly fraught as Berrettini threw the kitchen sink at the Serb who becomes only the second man to reach 40 Grand Slam semi-finals after Roger Federer.
'There is so much excitement brewing about Wednesday's Alcaraz and Rune quarter-finals showdown -- it could well be a juicy foretaste of things to come.'
Reactions to Novak Djokovic winning his 20th Grand Slam singles title at Wimbledon
Daniil Medvedev will play Rafael Nadal for the Australian Open title on Sunday after a stirring victory over Greek fourth seed Stefanos Tsitsipas in the semi-final on Friday.
Casper Ruud has become the first Norwegian to book a place in the season-ending ATP Finals, leaving one spot to be filled at the tournament in Turin, Italy later this month.
Alexander Zverev continued to rebuild his confidence on clay with a straight sets win over Spain's Roberto Bautista Agut in the Monte Carlo Masters second round.
Italian top seed Matteo Berrettini marked himself down as a genuine Wimbledon threat after beating Britain's Cameron Norrie 6-4, 6-7(5), 6-3 to win the Queen's Club title on Sunday.
Frances Tiafoe sealed Team World's first victory over Team Europe in the Laver Cup as he saved four match points on the way to beating Stefanos Tsitsipas on Sunday.
World No 1 Djokovic on Sunday won his sixth Wimbledon title. With this win, Djokovic now has 20 Grand Slams to his name and he is now equal with Swiss tennis maestro Roger Federer and Nadal.
Novak Djokovic believes he is the best player in the modern era