Lydia Ko bolts to lead at CME Group Tour Championship

Lydia Ko (Getty)

World number one Lydia Ko is back in the hunt for the million dollar prize at the season-ending CME Group Tour Championship in Florida after a record-setting second round.

The 19-year-old reeled off 11 birdies on her way to a new course record of 62 to claim a three shot lead with two rounds to play.

Ko was sitting in a share of the lead with Korea's So Yeon Ryu at the start of the day's play, at 8-under-par.

She can defend her player of the year title by winning the tournament and finishing ahead of Thai rival Ariya Jutanugarn, who closed eight shots behind her Kiwi rival.

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