Daniel Berger shoots 64 to take 2nd-round lead in Memphis

Daniel Berger hits out of a sand trap on the 18th fairway on the second day of the FedEx St. Jude Classic golf tournament, Friday, June 10, 2016, in Memphis, Tenn. (AP Photo/Rogelio V. Solis) (The Associated Press)

Phil Mickelson watches his tee shot on the 11th tee on the second day of the FedEx St. Jude Classic golf tournament, Friday, June 10, 2016, in Memphis, Tenn. (AP Photo/Rogelio V. Solis) (The Associated Press)

Dustin Johnson reacts to a double bogey on the 18th hole during the second day of the FedEx St. Jude Classic golf tournament, Friday, June 10, 2016, in Memphis, Tenn. (AP Photo/Rogelio V. Solis) (The Associated Press)

Daniel Berger shot a season-best 6-under 64 on Friday to take a three-stroke lead in the FedEx St. Jude Classic in Memphis, Tennessee.

Berger had six birdies in his bogey-free morning round to reach 9-under 131 at TPC Southwind, and nobody caught him atop the leaderboard. Berger has started well, despite breaking in a new driver and 3-wood after his old clubs finally cracked last week from age.

Tom Hoge, part of a three-way tie for the lead after the first round, was second after a 69. He birdied the final two holes in the next to last group.

Dustin Johnson, the 2012 champion, had a chance to catch Berger until dropping three strokes on the final two holes. Johnson finished with a 69 after wiping out four birdies and an eagle with three bogeys and a double bogey on No. 18 with what he called bad swings at the end.

That finish left Johnson tied with Phil Mickelson (65) and Brooks Koepka (65) at 5 under. Mickelson, winless since the 2013 British Open, matched his low round this year with six birdies and one bogey. He's here fine-tuning his game for the U.S. Open next week, the one major that has eluded him in his career.