Saudi Arabia, the world’s largest oil exporter, deepened the discount at which it sells crude to Asia and the U.S., underscoring for some market watchers the kingdom’s commitment to defending its market share amid the recent rout in oil prices. The move comes a week after Riyadh persuaded fellow OPEC members to maintain the group’s production target, instead of reining in output significantly to support prices. Brent crude, the global benchmark, slid 0.4% to $69.64 a barrel on the news, reversing earlier gains. That’s the lowest level since May 2010 and brings Brent’s year-to-date decline to 37%. U.S. crude-oil prices dropped 0.8% to $66.81 a barrel, but remained above the more-than five-year low hit Nov. 28. State-owned Saudi Aramco Oil Co., also known as Saudi Aramco, said Thursday that it had reduced its official selling prices for all oil grades bound for Asia in January by between $1.50 and […]