Justin Rose surged into a four-shot lead as Rory McIlroy and Bryson DeChambeau were among the big names to endure first-round struggles at The Masters.
Rose was two over through seven holes in tough scoring conditions, with quicker and firmer Augusta greens proving a much bigger challenge than when Dustin Johnson won the tournament with a record score of 20 under last November.
The Englishman sparked into life with an eagle at the par-five eighth hole and lit up the back nine to card a magnificent seven-under 65, the lowest Masters round of his career, with patrons allowed back in under blue skies.
Rose, eyeing a maiden Masters title, got on a roll with seven birdies in nine holes before finishing with a composed par to retain his four-stroke advantage.
Brian Harman and Hideki Matsuyama shared the early clubhouse lead with impressive three-under opening rounds of 69 before Rose stormed clear.
Defending champion Johnson shot a two-over 74 following a double bogey at the 18th, having made a bogey-birdie start before getting in the red for the first time at 13.
Masters debutant Will Zalatoris, Webb Simpson, Christiaan Bezuidenhout and Patrick Reed will start their second rounds on two under following encouraging starts, while new father Jon Rahm and Xander Schauffele are among a clutch of players at level par.
McIlroy suffered a miserable opening round and is back on four over, facing a battle to make the cut rather than fight it out to complete a career Grand Slam, while U.S. Open champion DeChambeau was four over through 15.
Jordan Spieth was left to rue a triple-bogey after launching a wayward tee shot into the trees at the ninth but was in a share of eighth on one under after chipping in for an eagle at 15, while Justin Thomas was a further stroke back through 15.
Brooks Koepka matched Johnson's 74 just a few weeks after undergoing knee surgery and the previously in-form Lee Westwood is languishing on six over.
Tommy Fleetwood generated a roar from those fortunate enough to be at the 16th to see him make a hole-in-one before he signed for a 74.
Scheffler swinging with confidence at Tour Championship despite seeing lead cut to four
Scottie Scheffler insists his swing is "in a good spot" despite seeing his lead at the top of the Tour Championship standings cut to four shots on the second day.
Scheffler, who is aiming to win his first FedEx Cup title, carded 65 in his opening round and entered the second round with a 10-shot lead.
However, the world number one saw American duo Collin Morikawa and Xander Schauffele close the gap during a weather-disrupted second round on Friday.
Scheffler carded a round of 66 to take himself to 21 under par, aided by two birdies in the final three holes to keep the chasing back at bay.
"I feel like my swing is in a good spot, and I've hit it nice the last couple of days," he said. "A lot of quality stuff out there, and in a good spot going into the weekend."
Morikawa is four shots off the pace after producing a superb eight-under 63, which was the best round of the day, and has surged up the standings to second place.
In an impressive round, he dropped just one shot on the 11th hole, but made amends on the back nine before closing with back-to-back birdies.
"He's going to continue to make birdies," Morikawa said about the possibility of catching Scheffler. "He's driving it really, really well here, and you're giving yourself enough wedges to make some scoring opportunities out there.
"For me, it's just about bringing energy and just staying alive out there."
Schauffele is in third, one shot behind compatriot Morikawa, after shooting an impressive second-round 64 to remain in the hunt for the $25million prize money.
There is then a four-shot gap until a group of three players, including Adam Scott, are tied for fourth place at 12 under, while Rory McIlroy is tied for 10th place on eight under.
'Still feel like I've got a chance', says McIlroy as Scheffler takes Tour Championship lead
Scottie Scheffler is in prime position to win his first FedEx Cup title after storming into a seven-shot lead at the Tour Championship.
The world number one, who started on 10 under due to the FedEx Cup's staggered structure, carded a superb 65 in the first round of the PGA Tour's season-ending tournament, after recovering from an early bogey at East Lake.
Scheffler's haul included seven birdies, with five of those coming from his last seven holes, as he bids to win a seventh PGA Tour event of the season.
His main FedEx Cup challenger Xander Schauffele is tied for second on nine under par, along with Collin Morikawa, while Rory McIlroy is three shots back in T10.
However, the Northern Irishman has not given up hope of applying pressure to Scheffler as the tournament goes on.
"I'm happy with how I hung in there and had a good finish," McIlroy told Sky Sports.
"When I saw Scottie had gotten to 14, I was like, 'Oh, got to try to just hang on to the coattails a little bit'.
"Still feel like I've got a chance, and it was nice to finish the way I did."
Scheffler, also speaking to Sky Sports, said: "Yeah, I'm pleased with the day.
"I tried not to think about any sort of lead or anything like that, my job was to go out there and execute and I felt like I did a really good job of that. I felt like I was doing some good stuff to start the day.
"I had the bogey on one but after that I felt like I played some really good golf."
Bradley in disbelief after moving into FedEx Cup contention with BMW Championship win
Keegan Bradley was in disbelief after putting himself in FedEx Cup contention by winning his second BMW Championship title on Sunday.
Bradley, who was appointed as the United States' 2025 Ryder Cup captain last month, edged out Adam Scott to claim a one-shot victory at the event near Denver.
Scott pulled level with Bradley at the start of his final round but later bogeyed three straight holes as the American won his seventh PGA Tour title.
Bradley, who also won the 2018 tournament by beating Justin Rose in a play-off, now sits fourth in the FedEx Cup standings, behind Scottie Scheffler, Xander Schauffele and Hideki Matsuyama.
Following his victory, the 38-year-old set his sights on another triumph at next week's Tour Championship in Atlanta, having only just squeezed into the 50-player field at Castle Pines.
"Oh, man, it just shows why you've got to grind it out every week because you never know how fast it can switch," Bradley said.
"Now I go to Atlanta with a chance to win the FedEx Cup. I can't believe it. I'm so excited.
"I'm in a bit of a state of shock because there was a time a week ago about this time that I didn't think I was going to be coming here.
"I had to have a lot of magical things happen for me to just play in this tournament, and when I got here, I was so grateful just to be here.
"I played with a real sense of calm all week, which is not the norm for me"
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