Former No. 1 Martina Hingis unretires to play doubles tournament
Hingis, 32, will team with Daniela Hantuchova for her first WTA tournament appearance in nearly six years.
Hingis was the game's best player for a period in the late 1990s. Her success came in the gap between dominance by Monica Seles and Steffi Graf and the emergence of Serena and Venus Williams. Hingis won three majors in 1997 (all but the French Open) and added Australian Open titles in 1998 and 1999.
She was even more successful playing doubles. She won nine Grand Slam titles with six different partners, the last with Anna Kournikova at the 2002 Australian Open.tested positive for cocaine