The three-shot gap to the leader after the first round remained after Friday's round for Åberg.
After a tricky putt - and bogey - on the fourth hole, the Swede played generally solidly and lined up birdies. The round resulted in a total of -7.
Meanwhile, Norwegian Viktor Hovland continues to impress and now shares the lead with American Ryan Gerard at -10.
The PGA Tour Finals competition brings together 30 players who have qualified through the season rankings and playoff rounds. Ludvig Åberg is the only Swede left in the field.
The winner will take home the equivalent of approximately SEK 95 million.
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