DORAL, Fla. — Phil Mickelson’s scores from Doral over the past two years clearly suggested that the redesigned Blue Monster wasn’t completely to his liking.

He had to re-learn a course that he had played for more than 20 years, and indicated Thursday that he finally has the new Doral figured out.

Mickelson shot a 5-under 67 on Thursday in the opening round of the Cadillac Championship, the first World Golf Championships event of the year. Seeking his first win since the British Open in 2013, Mickelson made seven birdies and finished the day one shot back of leaders Scott Piercy and Marcus Fraser.

“There is a bit of a learning curve on some of the contours and where you have to go and where you want to go and the best place to be,” Mickelson said. “It’s not like I came in here weeks before and mapped it out like a major. You’re here only the week of. But this is our third year here now and it continues to get better each year.”

Fraser had seven birdies before his lone bogey of the day, and Piercy also got to 7 under at one point before settling for his 66.

Mickelson made bogey only twice, immediately erasing each with a birdie on the following hole, and the 67 was nearly six full shots better than his average round score at Doral in his previous two visits.

Danny Willett, Adam Scott, Jason Dufner and Charley Hoffman were all two shots back of Piercy, each carding 68s. World No. 1 Jordan Spieth was in a group another shot back, three off the pace at 3 under, and said that even on a relatively calm day by Doral weather standards, it felt like a grind.

“It always is here,” Spieth said. “And this would be a day that should play about as easy as it possibly can with just a 5- to 10-mile-an-hour breeze. The standard wind here I think. Still, the scores aren’t extremely low.”

Spieth was in a featured group, with world No. 2 Jason Day and No. 3 Rory McIlroy with him. McIlroy shot 1 under, Day finished at even par.

LPGA: Australian teenager Minjee Lee grabbed a share of the lead with Taiwan’s Candie Kung at the LPGA’s Women’s Champions tournament in Singapore on Thursday.

Lee made four birdies and an eagle in her opening round of 5-under 67 to join Kung at the top of the leaderboard on a windy day at the Sentosa Golf Club.

The defending champion, South Korea’s Inbee Park, was among a group of four players tied for third at 4-under 68, while the world No. 1 Lydia Ko and in-form American Lexi Thompson both shot rounds of 1-under 71.