He became a professional at age 22, after a stellar amateur career.

He started playing when he was 11 and became a professional at the age of 12.

It was such a pleasure to see a professional performing at her best.

He became a professional in 1966, at the age of 14.

Sam became a professional in 2003, at the age of 18.

You should be a professional at a meeting, too.

"For want of a better word, I'm a professional at this," she says.

A professional at his position who knows what it takes to win.

He was the third racer to turn professional at the time.

He's strict and professional at work, with a strong sense of responsibility.