Which tennis player Anna-Lena Grönefeld or Mats Wilander turned professional first ?
Anna-Lena Grönefeld:  She turned professional in April 2003. Mats Wilander: Mats Wilander (] ; born 22 August 1964) is a former World No. 1 tennis player from Sweden. Mats Wilander:  From 1982 to 1988, he won seven Grand Slam singles titles (three at the French Open, three at the Australian Open, and one at the US Open), and one Grand Slam men's doubles title (at Wimbledon).
Mats Wilander