Lydia Ko, Jason Day (66) take lead at Thornton Invitational

Jason Day and Lydia Ko recorded the low round of the day to jump atop the leaderboard after two rounds of the inaugural Grant Thornton Invitational on Saturday in Naples, Fla.

The pair sit at 20 under and hold a two-stroke lead over first-round leaders Tony Finau and Nelly Korda, who struggled to a 70 on Saturday. Lucas Glover and Leona Maguire are tied for second at 18 under after carding a 69.

There's a four-way tie for fourth at 16 under.

Saturday's format was foursomes, with each team's players alternate hitting shots with the same ball until the ball is holed.

Day and Ko offset their lone bogey with seven birdies to vault into the lead.

"I think this is just a great experience for me and I hope a lot of juniors who are either here this week or watching on the TV get inspired and hope that one day they play on the PGA or the LPGA and they too are paired up with another fellow player on the other tour," Ko said. "This is I think the outcome and result is secondary. I think for us, we don't really get to I guess cross paths that much with other tours. Jason's only the fourth PGA Tour player I've played with. I think it's a great — something that I can learn a lot from."

Rickie Fowler and Lexi Thompson were the only team with an eagle in the second round, with 11-time LPGA Tour winner Thompson recording an ace at the par-3 16th. They are one of the teams T4.

—Field Level Media