Conversation so far:
How does Marat Safin's career start?
Marat Safin started his professional career in 1997.
Where does Marat Safin play after starting his professional career?
In 1998, at the French open.
Does Marat Safin win at all in the 1998 French Open?
In 1998, Marat Safin consecutively defeated Andre Agassi and defending champion Gustavo Kuerten at the French Open.
How many times does Marat Safin win?
Is Marat Safin considered a good player?
Marat Safin held the No. 1 ATP ranking for 9 weeks during 2000 when he won his first Grand Slam tournament at the US Open.

Question: How many times has he lost?
Self-contained rewrite: How many times has Marat Safin lost?