Sergio Garcia fired a seven-under 64 to storm to the top of the Deutsche Bank Championship leaderboard at 13-under.
Garcia went out early and watched his lead hold up as 18-hole co-leader Phil Mickelson fought his way to an even-par 71 to stay at eight-under.
Still, a few golfers are nipping at Garcia's heels, and that group starts with Roberto Castro and Henrik Stenson, who just might be the best golfer on the planet right now. That pair is tied for second at 12-under.
Take a look at the leaderboard, and then we'll get further into the recap.
Garcia woke up on the right side of the bed on Saturday because he hit the course on fire with birdies on five of his first seven holes. The 33-year-old Spaniard picked up two more strokes with birdies on Nos. 11 and 13 but gave those two strokes back with a double bogey on the par-four 14th.
Plenty of times in Garcia's career a double bogey like that would have sent him plummeting down the leaderboard. However, he righted the ship, parring the next three holes and finishing off his round in spectacular fashion with an eagle:
He was striking the ball off the tee wonderfully and hit 85.7 percent of his fairways. He also had a nice feel going with his flat iron, which TaylorMade was all too happy to point out:
Hitting 1.842 strokes gained-putting, it was indeed a nice day on the greens for the man once referred to as "El Nino."
As great as he was, Garcia's hot start did not impress Roberto Castro.
As you can see, Castro was five-under through just five holes. That left him on pace to shoot a tidy 53. He couldn't maintain it—shocking, I know.
In fact, it looked like he was going to fall off the radar completely as he played the 13th and 14th at a combined three-over.
However, the 28-year-old steadied himself and was able to finish the rest of his round at two-under to finish with his second consecutive 65. That leaves him sitting at 12-under for the tournament.
As great as Garcia's and Castro's rounds were, reigning U.S. Open champ Justin Rose was better. The Englishman was nearly flawless on Saturday. He didn't suffer a single bogey while picking up eight birdies en route to his eight-under 63.
Check out some of the facts from his remarkable round:
Rose's performance pushes him into contention for the second straight week. Just last week, he sat on the green of the 72nd hole needing to get down in just two putts to force a playoff. Instead, he three putted and watched Adam Scott take the title.
Speaking of Scott, as the afternoon rolled around, all eyes were on his group:
After his eight-under on Friday left him as the 18-hole co-leader, expectations were high for Phil Mickelson. He couldn't live up to them as he lost all control off the tee as the day wore on.
He was two-under for the front side, but that is when things got interesting. "Lefty" spent more time in the woods on the back side than the fairway.
After recovering from a rough back nine, he wound up with a birdie on the final two holes to shoot a 71 and end the day where he started: at eight-under.
That would have been far worse were it not for his insane short game:
His ability to stay in contention left comedian and avid golf fan Norm McDonald impressed:
Meanwhile, as Lefty struggled, Tiger Woods made up ground. Woods played the front nine at just one-under, but a bogey-free back nine allowed him to climb to seven-under for the tournament with a round of 67.
As the day wore on, he began dialing in his approach game. Check out this quality shot on No. 16, which led to a birdie:
With Woods picking up steam, he is not out of contention, and with TPC Boston surrendering so many low scores, almost everyone is still in play. It should be a wild two-day finish.