Federer’s wife Mirka, a former player, is said to run domestic affairs with military precision and father of twins Nenad Zimonjic, ranked three in the world in doubles, believes a supportive partner is essential for a harmonious work-life balance.
“My wife took care of most things and was happy to travel with the kids, which made it easier to concentrate on tennis,” says the 38-year-old.
“We would stay in apartments or a hotel with adjoining rooms so it didn’t affect my business, which is to play tennis.
“You never know how long you’re going to stay in a tournament, that’s the problem when you’re travelling with a family, so you play in tournaments you know you have a chance of staying in for a while.”
While tennis tournaments may not be the toddler’s pink paradise that is Peppa Pig World, they are not hostile environments for families. Many, especially in America, provide play areas and organised day trips to the zoo for players’ children.
“It is common to see kids playing with each other,” says Karlovic, who describes the prospect of his daughter joining the tennis brood as a “delight”.
“It will be life-changing for Novak, but it’s one of the best things in life. He must enjoy it, it will be a lot of fun.”