Oil futures gained on Monday after OPEC sources said Saudi crude production unexpectedly fell in July, raising concerns about global oil supplies as the United States prepares to reinstate sanctions against major exporter Iran. Front-month U.S. West Texas Intermediate crude futures ended up 0.32 percent at $68.90 a barrel. Front-month Brent crude futures gained 0.34 percent to $73.67 a barrel. The spread between the two benchmarks stood at $4.77 a barrel.

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