Dustin Johnson is on top of leaderboard at the halfway stage of the Northern Trust.
The American is one shot ahead of Jordan Spieth after two rounds of the PGA Tour's play-off event.
Meanwhile Tiger Woods was forced to withdrew before Friday's round because of "mild oblique strain that led to pain and stiffness".
The third round gets underway later on Saturday.
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Southampton expelled from EFL playoff final after spying breach
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DR Congo prepares for World Cup despite Ebola outbreak
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LIV Golf focused on long-term funding amid reports of potential bankruptcy
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Alcaraz to miss Wimbledon as he continues to recover from wrist injury
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