Oil fell below $59 a barrel on Monday as traders doubted all OPEC members would follow Saudi Arabia's lead to curb output under an agreement reached last week.
U.S. crude fell 86 cents to $58.47 a barrel by 1009 GMT. The front month contract lost $1.68, more than 2 percent, on Friday to hit its lowest level this year.
London Brent crude dropped 93 cents to $58.75.
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Oil Fell Below $59
Oil fell below $59 a barrel on Monday as traders doubted all OPEC members would follow Saudi Arabia