Storms brought a premature end to the action at Augusta on Friday night, meaning a significant portion of the field returned on Saturday morning to complete their second rounds and they were greeted by grim conditions.
Rahm defied that to book his place in the final group, with the delays meaning it will be a two-tee start for the third round and preventing pairings on Saturday. Koepka and Rahm will be joined by amateur Sam Bennett at 6:04pm BST.
At the same time, Tiger Woods will be getting his round underway on the 10th tee, after making the cut on the number.
Round 3 tee times
(All times BST – *denotes starting on 10th tee)
4:30pm: Adam Scott, Patrick Cantlay, Cameron Smith
4:30pm*: Sepp Straka, Harold Varner III, Dustin Johnson
4:42pm: Tom Kim, Keegan Bradley, Xander Schauffele
4:42pm*: Scottie Scheffler, Tommy Fleetwood, Tony Finau
4:54pm: Hideki Matsuyama, Harris English, Matt Fitzpatrick
4:54pm*: Sahith Theegala, Abraham Ancer, Mito Pereira
5:06pm: Kyoung-Hoon Lee, Ryan Fox, Patrick Reed
5:06pm*: Tyrrell Hatton, Max Homa, Chris Kirk
5:18pm: Justin Rose, Russell Henley, Shane Lowry
5:18pm*: Taylor Moore, Si Woo Kim, Zach Johnson
5:30pm: Gary Woodland, Phil Mickelson, Joaquin Niemann
5:30pm*: Fred Couples, Mackenzie Hughes, Seamus Power
5:42pm: Sam Burns, Jordan Spieth, Cameron Young
5:42pm*: J.T. Poston, Talor Gooch, Keith Mitchell
5:54pm: Collin Morikawa, Viktor Hovland, Jason Day
5:54pm*: Charl Schwartzel, Billy Horschel, Scott Stallings
6:06pm: Brooks Koepka, Jon Rahm, Sam Bennett
6:06pm*: Thomas Pieters, Tiger Woods, Sungjae Im
