Gonzalez will retire next month

Chilean star Fernando Gonzalez says he expects to retire from the ATP World Tour next month.

The former Australian Open runner-up, who has been plagued by hip, knee and back injuries over the last several years, will end his tennis-playing days after the Sony Ericsson Open in Miami, which will star March 21 in Key Biscayne.

The 31-year-old Gonzalez has reached 21 career finals, going 11-10. The former world No. 5's last title came in Vina del Mar in his native Chile in 2009.

"Gonzo" also owns three Olympic medals -- gold, silver and bronze. The gold medal was a doubles one, alongside Nicolas Massu, in Athens in 2004.