Monaco capitalised on some good fortune to seal an emphastic Ligue 1 win at Nancy, with all the goals in the second half.
Own goals from Benjamin Gavanon and Jordan Loties handed the initiative to the visitors - and as home heads dropped Park Chu-young netted twice in the last 10 minutes to seal a convincing away success.
It was a sickening result for Nancy, who created most of the first half's decent openings.
Youssouf Hadji shot inches wide in only the seventh minute and seven minutes later Monaco goalkeeper Stephane Ruffier needed two attempts to deny Samba Diakite's powerful effort from more than 20 yards.
Ruffier was busy again after half an hour, blocking with his foot after Julien Feret had threatened to surprise him with a shot from the edge of the penalty area.
The visitors created their first worthwhile opening seven minutes before the break - but goalkeeper Damien Gregorini dived to keep out Sebastien Puygrenier's free-kick.
Monaco were first to threaten in the second half, with Pierre-Emerick Aubameyang's superb volley narrowly clearing the home crossbar.
Gavanon gifted the visitors the lead in the 54th minute, heading into his own net as he tried to clear Aubameyang's header from Puygrenier's free-kick.
And more bad luck followed for the hosts seven minutes later when Loties deflected the ball in as he tried to clear Chris Malonga's dead ball delivery, under pressure from Petter Hansson.
Monaco's third goal was all their own work, Park netting after good work down the right by the influential Aubameyang - and the same two combined four minutes from time, Park rounding off the goalscoring with a low shot.