To turn pro, in sports, is when an athlete transcends (usually by means of great skill) from an amateur league to a professional league.
For example:
In the MLB (Major League Baseball), it is common for players to turn pro after playing in the Minor Leagues (a semi-professional amateur league) for a while.
You don't need a tour card to turn pro. He simply earned his after he turned pro.
He turned pro at age 16.
Jack Nicklaus turned pro in late 1961.
Rafael Nadal turned pro in 2001
at 13
2001
1993
turn it on
Get Guitar pro 5, and go to www.tabscout.com.
if they are on flat land they do a small ollie and turn their board right or left
Cooper and Brady Turn Pro - 2005 was released on: USA: 27 March 2005 (Longbaugh Film Festival)
Some high school atheletes turn pro before they consider college.