* Paris St Germain defeat Stade Reims 1-0 * Ancelotti's men join Marseille on 19 points (Adds late games, details, quotes) PARIS, Oct 20 (Reuters) - Paris St Germain went to the top of Ligue 1 on Saturday after a Kevin Gameiro header clinched a hard-fought 1-0 home victory over Stade Reims. Tennis great Rafa Nadal, who received a PSG jersey from striker Zlatan Ibrahimovic before kickoff, looked on as Reims wasted a chance to go ahead in the 40th minute when Diego's penalty was saved by keeper Salvatore Sirigu after Gregory van der Wiel had handled. ... More...