Ghana captain Asamoah Gyan scored from the penalty for spot for Al Ain but the UAE champions succumbed to a 3-2 home defeat inflicted by leaders Al Ahli on Sunday evening.
Gyan halved the deficit for Ain after brilliantly converting a penalty kick in the 78th minute but the Pro League title-holders could not sustain themselves as Brazilian Grafite netted twice to for the visitors to cruise to victory.
Ain have not had the rosiest of season domestically as their title hopes has far slipped beyond them.
But the Black Stars skipper has maintained his fine scoring form in all competitions since the start of the season scoring 19 goals in 20 league games.