The 20-year-old winger ran from his own half against Vitesse Arnhem before firing the ball into the net to help earn his side a 3-0 victory.
Nice went on to win the race for his signature, and he looks to be a shrewd buy.
Allan Saint-Maximin, that is special!— BT Sport Football (@btsportfootball) September 28, 2017
From deep in his own half...to the opposition's goal ⚡️
Nice have some player on their hands! pic.twitter.com/HaKhLJyVp0
Saint-Maximin had three shots at goal in the 3-0 win, and now has two goals in two Europa League matches.
The youngster had a modest return at Bastia last season, but already looks like a smart buy for Nice, who Monaco may regret letting go on the cheap.
Tottenham have swing and missed on two Ligue 1 wingers in recent seasons, Clinton N'Jie and Georges-Kevin N'Koudou.
You almost can't blame them then, for stepping aside on Saint-Maximin.
But their new caution may have seen them miss out on a gem, who last night showed more finishing ability than N'Koudou has in more than a year so far at Spurs.