PSG’s Thiago Silva, center, heads the ball during their League One soccer match against Guingamp, at the Roudourou stadium, in Guingamp, western France, Saturday, Dec. 17, 2016. Defending champion Paris Saint-Germain slipped to its fourth defeat in the French league, losing at Guingamp 2-1 on Saturday in another setback that will crank up the pressure on coach Unai Emery.