The words Jason Day has used all week at Bay Hill are what he gets from Tiger Woods whenever they talk about playing with the lead.

Patience. Aggression. Extend the lead. And if you’re not on your game, post a good score.

It carried Day to a 2-under-par 70 in rough weather Saturday in Orlando at the Arnold Palmer Invitational, giving him a two-shot lead. He has won the last three times he had at least a share of the 54-hole lead.

‘‘It’s a different pressure, but it’s a good, uncomfortable feeling that I've always talked about, that I always want in my career,’’ Day said. ‘‘Because I know that if I've got that, I have a comfortable feeling that I'm doing it right. And usually, I'm around the lead.’’

It wasn’t easy Saturday, even though tee times were moved forward because of a forecast of storms in the afternoon. That didn’t keep the rain from showing up, occasionally heavy, or for the temperatures to fluctuate and the wind to swirl.

Henrik Stenson caught up and briefly passed Day. Troy Merritt and Kevin Chappell hung around.

‘‘I felt like I couldn’t get any momentum, especially with the umbrella up and down, the rain gear on and off,’’ Day said. ‘‘All that said, I feel like I stayed patient to ground out a 2-under par.’’

Day finished at 15-under 201, two shots clear of Stenson (70), Merritt (67), and Chappell (67).

It was a grind for everyone.

Stenson wasted little time cutting into the deficit when he two-putted for birdie on the par-5 fourth, hit wedge to 6 feet for birdie on the next hole and then took the lead with a 10-foot eagle putt on the par-5 sixth.

But the next hole was the start of some frustrations. Stenson found a plugged lie in the bunker, didn’t try anything fancy and accepted a bogey. He caught two other buried lies in the sand, one that cost him momentum. His tee shot narrowly missed clearing the bunker on the par-5 12th and plugged under the lip. Stenson could only hit wedge to get out and made bogey. That cost him a share of the lead, and Stenson never caught up.

Even so, he is a threat at Bay Hill. Stenson is now 51 under in his last 17 rounds — 16 of those under par — and had a chance to win last year until a pair of three-putts (for bogey and for par) late in his round.

‘‘Hopefully, we’re in a different position now,’’ Stenson said. ‘‘We need to come from behind and play a really good round tomorrow if we want to have a shot at it.’’

LPGA — Sei Young Kim stumbled in the JTBC Founders Cup in Phoenix, handing the lead to Eun-Hee Ji and putting Stacy Lewis, Lydia Ko, and many others in far better position than they expected.

Three strokes ahead after an eagle on the par-4 13th, Kim bogeyed the par-4 16th and par-3 17th and finished with a 2-under 70 to drop into a tie for second with Lewis — a stroke behind Ji.

Ji shot a 65 to reach 18-under 198.

Lewis, who had a 64, won in 2013 and finished second the last two years. She has nine runner-up finishes in a 43-event victory drought.

Jacqui Concolino was two strokes back after a 68. The top-ranked Ko, Carlota Ciganda and Paula Creamer were another shot behind. Ko and Ciganda shot 64, and Creamer had a 67.

Champions — Scott Verplank shot his second straight 6-under 66 to take the second-round lead in the Tucson Conquistadores Classic.

The 51-year-old Verplank birdied five of the first six holes and seven of the first 10 in perfect conditions on Omni Tucson National’s Catalina Course. He bogeyed the par-3 12th, failing to get up-and-down from a greenside bunker, and closed with six consecutive pars.

Winless on the senior tour, the five-time PGA Tour champion has fought a series of injuries. He also is diabetic and wears a pager-sized insulin pump on the course.

Jim Carter and Wes Short Jr. were a stroke back.

The 54-year-old Carter shot a 63. He birdied nine of the first 13 holes, making six straight on Nos. 8-13. A former Arizona State player, he won the 2000 PGA Tour event at Tucson National for his lone title.

The 52-year-old Short tied the tour record for eagles in a round with three in his 65. He’s the 10th player to accomplish the feat in tour history.

Bernhard Langer, defending champion Marco Dawson, and first-round leader Woody Austin were tied for fourth at 9 under. Langer, coming off a victory Feb. 14 in Naples, Florida, in the last tour event, had a 66. Dawson shot 67, and Austin followed his opening 65 with a 70.

European/Asian — SSP Chawrasia, who has finished second in the event four times, leads the Indian Open after a flawless third-round 68 in New Delhi.

Chawrasia, who went four under for the first eight holes, had a two-shot lead over Terry Pilkadaris (73).