Harman leads at 12-under 204, one shot clear of Thomas, who shot a record-breaking, 9-under 63 on Saturday.
They will go off at 3:54 p.m. ET Sunday at Erin Hills.
Rickie Fowler (10 under) and Players champion Si Woo Kim (9 under) are in the third-to-last group, at 3:32 p.m.
No player in the last nine groups has won a major championship.
Here are the full tee times:
9:51 a.m. ET: Haotong Li and Kevin Dougherty
10:02 a.m.: Tyler Light and Ernie Els
10:13 a.m.: Talor Gooch and William McGirt
10:24 a.m.: Stewart Cink and Kevin Kisner
10:57 a.m.: Jason Kokrak and Yusaku Miyazato
11:08 a.m.: Stephan Jaeger and Shane Lowry
11:19 a.m.: Jordan Niebrugge and Gary Woodland
11:30 a.m.: Adam Hadwin and Thomas Aiken
11:41 a.m.: Kevin Na and Ryan Brehm
11:52 a.m.: Martin Kaymer and Brandon Stone
12:03 p.m.: Rafa Cabrera Bello and Webb Simpson
12:14 p.m.: Harris English and Satoshi Kodaira
12:25 p.m.: Andrew Johnston and Jonathan Randolph
12:36 p.m.: Whee Kim and Martin Laird
12:59 p.m.: Jack Maguire and Scottie Scheffler
1:31 p.m.: Matt Fitzpatrick and Jim Furyk
1:53 p.m.: Jamie Lovemark and Cameron Champ
2:15 p.m.: Sergio Garcia and Eddie Pepperell
2:26 p.m.: Trey Mullinax and Louis Oosthuizen
2:37 p.m.: J.B. Holmes and Hideki Matsuyama
2:48 p.m.: Bernd Wiesberger and Xander Schauffele
3:32 p.m.: Rickie Fowler and Si Woo Kim
3:43 p.m.: Tommy Fleetwood and Brooks Koepka
3:54 p.m.: Justin Thomas and Brian Harman