Geraldine Dondit, a former world No 269 in the women’s division, spent two years as the personal assistant to Federer.
The Swiss star has needed a larger entourage since establishing himself as one of the greatest players of all time.
So he hired his wife Mirka’s good friend to help with some of his off-court organisation.
And Dondit, who is now the tournament director of the WTA Samsung Open in Lugano, has explained how she coped with working for the 20-time Grand Slam winner.
“I feel like I’m more because of Roger [rather than my playing career],” she told Swiss publication Blick.
“It’s amazing how well the Federer entourage is respected – even on a Parisian market I was once addressed.
“Many had the feeling that they talked to me a bit with Roger.
“I bow to your job someone even told me.
“But I do not like to be rated as my employer – he could be a complete jerk!
“Of course, that’s not the case with Roger.”
Dondit also explained how she got into working for the tennis legend.
“I knew Mirka first,” she added.
“When she then separated from her former boyfriend and coach, I accompanied her for about two months on the tour while studying.
“Some time later I helped the Federer team. I have always acted discreetly and correctly and Roger will probably have an open ear for life.
“I’m just amazed what he creates today! After his success I write to him. And he asks me how ticket sales are going in Lugano.
“I tell him then it’s harder than in Basel, where fans buy billets every day, believing that their home star Federer will almost certainly reach the final.”