Australia’s Min Woo Lee shot a 7-under-par 63 to rise into the lead in the third round of the Texas Children’s Houston Open on Saturday at Memorial Park.

This means that world No. 1 Scottie Scheffler is going to have work to do in order to capture his first victory of the season.

Lee holds a four-stroke lead on Argentina’s Alejandro Tosti, whose 65 put him in second place at 13-under. Australia’s Ryan Fox also posted 65 and shares third place with Ryan Gerard (68) and Scheffler (69) at 12-under

With three consecutive birdies, Lee built a three-stroke lead through 10 holes. He had a seven-hole stretch when he needed only seven putts and ended the round with four consecutive pars.

Scheffler, playing in what is essentially his home event, led by one shot after matching his course record with Friday’s 62. Some golfers had to complete the second round Saturday morning after thunderstorms delayed the event.

Scheffler didn’t have a bogey through the first two rounds but posted a pair on the fourth and 13th holes on Saturday.

Davis Thompson made a big move with a 64, putting him at 10-under.

Canada’s Taylor Pendrith was flirting with the lead through play Friday, but his 70 left him tied for 10th at 10-under.

Northern Ireland’s Rory McIlroy went from nearly missing the cut to briefly moving into the top 10 after Saturday’s 65. His chip-in for eagle on No. 8 (which was his second-to-last hole of the round) was a big boost as he heads into the final round in a tie for 14th place at 9-under.