U.S. oil tumbles 7.7% and logs worst loss in 3 years, as oversupply worries build - MarketWatch
U.S. oil tumbles 7.7% and logs worst loss in 3 years, as oversupply worries build MarketWatchU.S. oil on Friday registers the worst day in about three years, with the contract also notching a seventh straight weekly fall, as investors increasingly focus on ...