World No 1 Nelly Korda rocketed into contention for her first US Women's Open title with a second-round score of 67 at Erin Hills.

The American followed up Thursday's even round by carding seven birdies and two bogeys on Friday to sit among a group of six players tied for second on five under par.

Korda trails Japan's Mao Saigo by three shots after the 23-year-old took the outright lead with a round of 66.

Saigo won the Chevron Championship in a playoff for her first LPGA Tour title just over a month ago and has her sights on a second major.

But top-ranked Korda is leading the group of six players on her tail after carding the best round she's had in the event.

After failing to make a birdie until the 18th hole of her opening round on Thursday, Korda had seven on Friday thanks to her

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