MEXICO CITY (Reuters) - Mexico's presidential election favorite Enrique Pena Nieto is seen winning Sunday's race by a wide margin, according to exit polls for Mexican television stations.

Pena Nieto, bidding to return the once-dominant Institutional Revolutionary Party (PRI) to power, had a lead of between 8 and 11 percentage points over second-placed leftist challenger Andres Manuel Lopez Obrador, the exit polls showed.

Josefina Vazquez Mota of the ruling National Action Party, or PAN, trailed in third place in the exit polls.

(Reporting by Mexico City Newsroom; Editing by Eric Walsh)