Wahbi Khazri scored twice as St Etienne beat struggling Monaco 2-0 to move into second place in Ligue 1.
Monaco, Ligue 1 champions in 2017, remain mired in 18th as the pressure increases on coach Leonardo Jardim.
Monaco's miserable night was summed up by Radamel Falcao missing a sitter and hitting the post with another straightforward chance.
Khazri showed the Colombia striker how to finish.
The Tunisia international gave the home side the lead in the 41st minute. Monaco's slow and sloppy defence allowed Khazri far too much room.
Receiving midfielder Ole Selnaes's quick pass over the top of the centre-backs, Khazri deftly controlled the ball with the inside of his right foot, swiveled and drilled a shot into the bottom left corner.
After Falcao missed from six yards early in the second half, Khazri drilled in his second with a fine strike from 20 yards. He received a quick pass to feet after Monaco carelessly lost the ball in midfield.
Rarely for him, Falcao looked out of sorts and he hit the right post shortly after.
Jardim guided Monaco to the UEFA Champions League semi-finals in 2017, but his current side looks bereft of confidence, having lost 1-0 at home to Amiens in midweek without managing a shot on target.