"If we sweat, we sweat -- we know each other well," laughed Cathy Butcher, 73, arriving with her daughter Helen.
Carlos Alcaraz starts his bid for a third successive Wimbledon men's title, while volatile women's world number one Aryna Sabalenka will be in the spotlight as the grass-court Grand Slam gets underway on Monday.
British tennis players come under the spotlight at Wimbledon like nowhere else and the full glare will be trained on world number four Jack Draper as he leads a sizeable home assault at the All England Club starting on Monday.
Raducanu and Alcaraz practiced together at Wimbledon on Friday as part of a sponsors commitment and will play alongside each other at Flushing Meadows in September in the mixed doubles.
Miami Open champion Jakub Mensik, 19, and 18-year-old Brazilian Joao Fonseca are two teenagers McEnroe could envision breaking into the Alcaraz-Sinner rivalry, as well as big-serving American Ben Shelton.
World number one Jannik Sinner wants to use the Halle Open as a chance to bounce back from sleepless nights after his agonising loss to rival Carlos Alcaraz in the French Open final this month.
Taylor Fritz has his eyes on a ninth ATP title after beating Felix Auger-Aliassime 6-4, 7-6 (7/5) in the Stuttgart semi-finals on Saturday to reach his first final this year.
At five hours and 29 minutes it was the longest final at Roland Garros, smashing the previous record set by Sweden's Mats Wilander when he beat Guillermo Vilas in 1982.
Italian pair Sara Errani and Jasmine Paolini beat Kazakh Anna Danilina and Serbia's Aleksandra Krunic 6-4 2-6 6-1 to win the women's doubles title at the French Open on Sunday.
World number three Alcaraz had too much weight of shot off both flanks for his opponent, who retrieved valiantly but lacked the weapons to topple the top seed.
Former world number one and two-time Grand Slam winner Simona Halep announced her retirement from professional tennis on Tuesday after losing in the first round at her home event in Cluj.
Two-time Wimbledon champion Petra Kvitova will return to action this month after a 15-month maternity break, with the Czech set to play in three tournaments in the United States.
"He has lost only four or five matches in the past year, so it's crazy. I know people say who's better out of us. They say Jannik is better or some say me. It's all discussion."
Double Australian Open champion Jannik Sinner set his sights on mastering clay and grass courts to make himself a complete player after the Italian claimed his third hardcourt Grand Slam title on Sunday.
The 23-year-old came through a tense battle between the world's top two players 6-3, 7-6 (7/4), 6-3 on Rod Laver Arena, raising his arms in the air and looking to the sky in celebration.
The victory earned the Italian world number one his third Grand Slam crown.
The former world number one responded on Saturday, posting a photo of an MRI taken of his left hamstring on the social media platform X with the caption: "Thought I'd leave this here for all the sports injury 'experts' out there."
It is Keys's first major title, having reached a second Grand Slam final eight years after her first in New York. She lost on that occasion to Sloane Stephens
Sinner's coach Darren Cahill said it was no surprise for him to see his young charge back in the final, but they were wary of the threat posed by Zverev's overarching desire to finally win a Slam.
