Paris Saint-Germain will finish 2015 with a 19-point lead at the top of Ligue 1 after Angers lost 1-0 at Saint-Etienne.
Benjamin Corgnet scored the only goal of the game on 62 minutes, denying Angers the chance of going back above Monaco into second place. PSG won 3-0 at fourth-placed Caen on Saturday to set a new record of 51 points at the halfway stage of the season after an unbeaten first 19 matches during the current campaign.
PSG also set a club-record 28-match unbeaten league run after expensive stars Zlatan Ibrahimovic and Angel di Maria both hit the target in Caen. Monaco are second after a 0-0 draw at winless and rock bottom Troyes on Saturday took them a point clear of Angers.
Saint-Etienne, who have struggled for form this season, moved up to sixth, just three points behind Monaco in the congested race for the European places.
"I'm not looking at the top of the table because we're also rather too close for comfort to the relegation zone," Saints coach Christophe Galtier admitted after the game. "Today's win was a key result, we really needed those three points," he added.
In Sunday's late game, 2009 champions Bordeaux and Marseille, who succeeded them to the title in an era before Qatari money helped PSG sweep all before them, drew 1-1.