In Monaco, defender Igor Lolo opened the scoring for the hosts with a bouncing shot after three minutes.
France international Kevin Gameiro leveled for Lorient in the 22nd with a first-time strike into the top corner off a long pass from Morgan Amalfitano.
Monaco forward Park Chu-young (right) celebrates his goal against Lorient. (AFP-Yonhap News)
Thomas Mangani outpaced the Lorient defense to give Monaco a 2-1 lead by beating goalkeeper Fabien Audard in the 56th.
South Korea midfielder Park Chu-young sealed the win in stoppage time by converting a penalty kick after Lorient defender Jeremy Morel fouled Jean-Jacques Gosso. (AP)