Jarmere Jenkins' phone lights up. It's an incoming call from his older brother Jermaine.
"Hey man, how would you like to work with Serena Williams?"
Jarmere - a former professional tennis player turned investment sales consultant, out of work and plotting his next career move - thought it was a joke.
Fast forward 14 months and he is an integral part of Team Serena, the small network of colleagues and confidants helping one of the world's all-time greatest players compete for Grand Slam titles again - little over a year after she "almost died" giving birth.