Spieth makes his move in weather-affected Genesis Open

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Jhonattan Vegas took a share of the lead and Jordan Spieth made his move at the Genesis Open but Dustin Johnson was among the players unable to start their second round due to rain and high winds on Friday.

Johnson could replace Jason Day at the top of the world rankings with a win at Riviera Country Club this week, but the U.S. Open champion faces an early start on Saturday after he was left kicking his heels on day two.

Vegas was three under through 14 to join Sam Saunders at the top of the leaderboard on seven under, but play was suspended after a tree beyond the 14th tee came down following a battering from the wind.

Venezuela Vegas made four birdies on the front nine and dropped just the one shot at 11 prior to the action being cut short, while Saunders will start his second round on Saturday.

Spieth is just two shots back from the leading duo after he was three under with two to play, putting himself in the mix to follow up his success at Pebble Beach last weekend with another victory.

Jason Kokra advanced five places to third after picking up two strokes through 10, while Johnson and Ben Crane are among the six players level with Spieth on five under.

Day, who will lose the number one spot if Johnson wins and he finishes tied for third or further back, improved to two under after 15 holes of his second round.

The Australian had been in a tie for 74th with two holes still to play in his first round when day one was cut short due to poor light in California.