Louis Oosthuizen has made six birdies in his third round at the US Open on Saturday. Photo: Rob Schumacher, USA TODAY Sports

ERIN, Wisconsin – Justin Thomas joined a logjam at the top of the US Open leaderboard on Saturday, rattling off six birdies and a bogey in his opening nine holes to grab a share of the lead as the third round got under way.

The 24-year-old World No 13 took advantage of benign conditions at Erin Hills to start with back-to-back birdies on the sprawling Wisconsin course.

He then bagged four more before the turn to move to 7-under alongside overnight leaders Paul Casey, Tommy Fleetwood, Brian Harman and Brooks Koepka.

Louis Oosthuizen of South Africa was another early mover, notching six birdies to move within one shot of the lead.

The 2010 British Open champion and 2015 runner-up was one of the first players out, and surged up the leaderboard with a flawless display.

The 34-year-old was 6-under with two holes to play in his third round.

Seven other players were on 6-under, including Japan's Hideki Matsuyama, who picked up an early birdie after his 7-under-par 65 on Friday.

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