Genesis Open 2017: Thursday Leaderboard Scores and Highlights

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The late Arnold Palmer's grandson stole the show Thursday in the first round of the Genesis Open at Riviera Country Club in Pacific Palisades, California.

Sam Saunders paced the field with a seven-under 64 and held off five golfers—including Dustin Johnson—who finished their rounds with a five-under 66. That crowded second-place group also features J.T. Poston, Daniel Summerhays, Brett Stegmaier and Cameron Percy.

Here's a look at the leaders with a full scoreboard available at PGATour.com:

While those top-six finishers completed their rounds Thursday, the same could not be said for the entire field. PGA Tour Media noted play was suspended for darkness at 5:34 p.m. PT,…