My role is to think about tennis and to help Serena Williams be the best she can be and do what she wants to achieve.

The tennis world is constantly changing. What's true today may be wrong tomorrow. If you don't make progress, others will and you will be overtaken.

He was feeling totally lost, leaving his family and country for a place where he knew nobody and didn't even speak the language.

My role is to think about tennis and to help Serena Williams be the best she can be and do what she wants to achieve.