PARIS, Nov 11 (Reuters) - Former world number one Marat Safin ended his playing career with a 6-4 5-7 6-4 defeat by U.S. Open champion Juan Martin del Porto at the Paris Masters on Wednesday.The 29-year-old Russian, who had saved three match points to squeeze past French qualifier Thierry Ascione in the first round of his final tournament on Monday, fought bravely against the Argentine world number five.“I knew there were not many chances I would beat him but I played pretty well, had pretty close calls,” said Safin, who was warmly cheered on by the crowd at the Bercy hall and greeted with rounds of the Mexican wave.Showing glimpses of his old form, Safin, who has not won a title since the 2005 Australian Open, challenged Del Porto by taking...