Martina Hingis as professional tennis player in 2005, 06, 07

Martina Hingis is a retired professional tennis player who spent a total of 209 weeks as World No. 1. She won five Grand Slam singles titles . She also won nine Grand Slam women's doubles titles, winning a calendar year Grand..

Return to play:
In February 2005, Hingis made an unsuccessful return to competition at an event in Pattaya, Thailand, where she lost to Germany's Marlene Weingartner in the first round. After the loss, she claimed that she had no further plans for a comeback.

Hingis, however, resurfaced in July, playing singles, doubles, and mixed doubles in World Team Tennis and notching up singles victories over two top 100 players and shutting out Martina Navratilova in singles on July 7. With these promising results behind her, Hingis announced on November 29 her return to the WTA Tour in 2006.

Martina Hingis in the Australian Open, 2006.

2006

At the Australian Open, Hingis lost in the quarterfinals to second-seeded Kim Clijsters. However, Hingis won the mixed doubles title with Mahesh Bhupathi of India. This was her first career Grand Slam mixed doubles title and fifteenth overall (5 singles, 9 women's doubles, 1 mixed doubles).

Hingis started the year by reaching the final of the Tier III Mondial Australian Women's Hardcourts in Gold Coast, Australia, losing to Dinara Safina of Russia 6–3, 3–6, 7–5. The next week at the Medibank International in Sydney, Hingis lost her first round match to Jelena Janković in three sets.

Retirement:
Hingis did not play any tournaments after the China Open, as she was beset by injuries for the rest of the year. However, on November 1, 2007, Hingis said at a press conference in Glattbrugg near Zürich that she was retiring permanently from competitive tennis. She admitted that she had tested positive for cocaine during Wimbledon in 2007. But Hingis maintained her innocence, saying, "I have tested positive but I have never taken drugs and I feel 100 percent innocent." She also said, "I would personally be terrified of taking drugs. When I was informed [about the test] I was shocked and appalled."