Paris St Germain got back to business in Ligue 1 after being knocked out of the Champions League by Real Madrid in midweek, hammering basement club Metz 5-0 at home and stretching their lead at the top of the standings back to 14 points.
Twenty-year-old Christopher Nkunku scored twice for Paris Saint-Germain at the Parc des Princes, with Thomas Meunier, Kylian Mbappe and Thiago Silva also on target.
"We have three trophies to go and win still and that is the most important thing", added Meunier, whose side are through to the French Cup semi-finals and play Monaco in the League Cup final at the end of this month.
However, that could not compensate for the frustrating exit from UEFA Champions League last 16 for the second straight season after losing 2-1 at home and 5-2 on aggregate to holders Real Madrid on Tuesday, reports Xinhua news agency.
Emery, who was jeered by some sections of the home support, had to somehow lift his side for this game, with Paris Saint-Germain missing suspended leading scorer Edinson Cavani as well as the injured Neymar. "We are the ones on the pitch".
"But this is football and, although we have great players, Madrid showed the difference between having great players and being champions".
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Nkunku snuck into the box and slammed the ball into the net with his left foot in the 20th minute then struck again in the 28th with his other foot, placing the ball into the far corner.
He was unlucky not to get a hat-trick, a header from Angel di Maria's cross on the stroke of half-time disallowed for a marginal offside call.
Metz are now eight points adrift at the bottom after Lille secured a morale-boosting point with a 1-1 draw against European hopefuls Montpellier.