Fayez Serraj, center. Photographer: Mohamed Ben Khalifa/AP Photo Virtually unknown in Libya until late last year, Fayez Serraj is quickly emerging as his country’s best bet to escape five years of deepening turmoil. The 56-year-old head of a fledgling United Nations-sponsored unity government last week sailed defiantly into a navy base near Tripoli. Instead of the hostility expected from politicians and militias, Serraj won support, offering a glimmer of hope that Libyans can halt a collapse that has uprooted nearly half a million people and enabled Islamic State to establish a presence on the Mediterranean. His chief rival left the capital, while important factions in 10 cities and several armed groups pledged loyalty. Critically for an economy facing bankruptcy amid an oil-production slump, the National Oil Corp. and central bank, which struggled to remain neutral as Libyan authority fractured between two administrations, gave their backing. He faces hurdles that […]