Sabalenka rebuilt her serve under the tutelage of biomechanics guru as Gavin MacMillan and the results followed, winning her first Grand Slam at the Australian Open in 2023 before retaining the title in 2024.
A first US Open followed last year, setting her up for Saturday's title defence.
Sabalenka's coach Anton Dubrov says happiness on and off the court has allowed Sabalenka to flourish.
"I think it's good for everyone to find this balance between the job and life, this work-life balance," said Dubrov. "This helps a lot because you feel more confident and safe on the court.
"Most of the time, I think athletes, if they lose, they think they're doing everything wrong outside of the court. On the court, it's your job. You're working. You're an athlete.
“Yes, it's a big part of your life, but at the same time, your life outside helps you do your job better. I think it's really helped Aryna to be more calm.”