Koepka was the only player not to card a single bogey on day one, but was denied the outright lead by a stunning finish from compatriot Bryson DeChambeau.
DeChambeau birdied the 15th, was inches away from a hole-in-one on the 16th, chipped in on the 17th and hit the pin from 196 yards on the last to match Koepka's six-under-par total.
Here's the order of play for the second round:
The Masters - Day Three
Show all 44
Friday tee times
All times BST
1330 — Sandy Lyle, Michael Kim, Patton Kizzire
1341 — Trevor Immelman, Martin Kaymer, a-Devon Bling
1352 — Larry Mize, Jimmy Walker, Stewart Cink
1403 — Jose Maria Olazabal, Kevin Na, Thorbjorn Olesen
1414 — Bernhard Langer, Matt Wallace, a-Alvaro Ortiz
1425 — Alex Noren, Keegan Bradley, Matthew Fitzpatrick
1436 — Vijay Singh, Billy Horschel, a-Jovan Rebula
1447 — Kevin Kisner, Kiradech Aphibarnrat, Shugo Imahira
1458 — Zach Johnson, Ian Poulter, Matt Kuchar
1509 — Francesco Molinari, Rafael Cabrera Bello, Tyrrell Hatton
1531 — Bubba Watson, Patrick Cantlay, Satoshi Kodaira
1542 — Dustin Johnson, Bryson DeChambeau, Jason Day
1553 — Phil Mickelson, Justin Rose, Justin Thomas
1604 — Jordan Spieth, Paul Casey, Brooks Koepka
1615 — Andrew Landry, Adam Long, Corey Conners
1626 — Ian Woosnam, Keith Mitchell, Kevin Tway
1637 — Mike Weir, Shane Lowry, a-Kevin O'Connell
1648 — Angel Cabrera, Aaron Wise, Justin Harding
1659 — Danny Willett, Brandt Snedeker, a-Takumi Kanaya
1710 — Fred Couples, Si Woo Kim, J.B. Holmes
1732 — Branden Grace, Emiliano Grillo, Lucas Bjerregaard
1743 — Charl Schwartzel, Charles Howell III, Eddie Pepperell
1754 — Sergio Garcia, Tony Finau, Henrik Stenson
1805 — Adam Scott, Hideki Matsuyama, Kyle Stanley
1816 — Patrick Reed, Webb Simpson, a-Viktor Hovland
1827 — Charley Hoffman, Louis Oosthuizen, Marc Leishman
1838 — Tommy Fleetwood, Xander Schauffele, Gary Woodland
1849 — Tiger Woods, Haotong Li, Jon Rahm
1900 — Rory McIlroy, Rickie Fowler, Cameron Smith
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