After 18 holes at Riviera Country Club, the Genesis Open is, well… wide open.

An opening-round 74 by the pre-tournament favorite Dustin Johnson caused his number to win the event to drop from +500 to +2500.

Tony Finau and Patrick Cantlay will begin Friday with a share of lead at 5-under after rounds of 66. Finau dropped from +6600 to +900, while Cantlay saw his price cut from +5000 to +1000.

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