Paris Saint-Germain turned on an attacking masterclass in their own backyard against Red Star Belgrade.
After losing their first Champions League game away at Liverpool 3-2, Thomas Tuchel's side beat the Serbian champions 6-1 in Paris.
Neymar scored a hat-trick, including two spectacular free-kicks.
However, there was slight surprise at just how bad Red Star were on the night, particularly after they held Napoli to a 0-0 draw in Belgrade.
Well, reports coming out of France suggest that their could have been something very unsavoury behind Red Star's performance that night.
According to L'Equipe, French authorities have been alerted by UEFA to open an investigation into match-fixing.
The report claims that the reason behind the demand is that a senior Red Star official supposedly wanted to place a bet on the Serbs to lose by five goals.
It is thought he wanted to wager nearly five million euros on the bet.
A very worrying report and if found guilty, Red Star would surely be banned from all European competition for a significant amount of time.
The story also seems to suggest that UEFA alerted the French authorities about the ordeal in the build-up to the game.
Apparently, only UEFA president Aleksander Ceferin and his close associates had any knowledge of the investigation taking place.
L'Equipe's report comes at a a time where Belgian football is in the midst of a serious match-fixing crisis.
Prosecutors in Belgium have already charged a number of high-profile figures and the findings from that case look like they're only going to get worse.