US co-leaders Brooks Koepka and Bryson DeChambeau were set for an early charge in Friday's second round of the 83rd Masters golf tournament with Tiger Woods and Phil Mickelson lurking.
Under rainy, overcast conditions at Augusta National, the second round began with Koepka and DeChambeau level atop the leaderboard after opening on six-under par 66 with Mickelson one stroke adrift.
Koepka, who missed last year's Masters with a left wrist injury, is playing Augusta National for the first time as a major champion, having last year defended his US Open title and won the PGA Championship.
"(It's) just an understanding of how to play and handle the bigger tournaments and understanding how to deal with pressure a little bit better," Koepka said.
"I get to whatever major championship it is and just when I arrive there, I just get a good feeling. I don't know how to explain it. I'm just dialed in and I'm focused the entire week."
"Just an accumulation of great golf that finally showed in the score."
- Tiger, Rory start late -
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"And so I feel like my body's good and my game's good, it's sharp, so just got to go out there and execute."