Talk of an output freeze by OPEC and Russia along with falling U.S. production spurred money managers to bet oil is ready for a rebound. Prices have risen 13 percent since Saudi Arabia, Russia, Venezuela and Qatar tentatively agreed on Feb. 16 to cap production at January levels. U.S. crude output dropped for a fifth week, government data showed Feb. 24. Hedge funds and other speculators increased their net-long position in West Texas Intermediate...