Lydia Ko has surged back into contention at the Canadian Women's Open after a sizzling four-under third round.

The 21-year-old is tied for seventh after three rounds at the Wascana Country Club in Regina, four shots behind the leader, local hope Brooke Henderson.

After starting the day with a couple of early bogeys, Ko's putter caught on fire as she sunk six birdies to sit at 10-under for the tournament.

Ko will be chasing Henderson who is in pursuit of a breakthrough home victory.

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The Canadian leads the tournament with a third round 70 to sit at 14-under, one shot ahead of Japan's Nasa Hataoka and American Angel Yin.

Meanwhile, fellow Kiwi Danny Lee carded a one-over 72 in the third round of the Norther Trust – the PGA Tour's opening playoff event – to sit tied for 58th at one-under par.

A double bogey at the par-five 17th saw Lee drop to an over-par day at the Ridgewood Championship Course in New Jersey.

Lee will now need a tidy final round to be one of the top 100 point scorers to make it to the second playoff event next weekend.

American Bryson DeChambeau leads the event at 16-under, four shots ahead of fellow American Keegan Bradley.