Credit to TexasJeromy off the WVU board.
REGULAR SEASON RECORDS AGAINST BIG 12 OPPONENTS SINCE 2012 (CURRENT CONFERENCE MEMBERSHIP)
COMBINED
1. Oklahoma 61-11 (.847)
2. Oklahoma State 44-28 (.611)
3. Baylor 42-30 (.583)
3. Kansas State 42-30 (.583)
5. Texas 41-31 (.569)
6. TCU 39-33 (.542)
7. West Virginia 36-36 (.500)
8. Iowa State 25-47 (.347)
8. Texas Tech 25-47 (.347)
10. Kansas 5-67 (.069)
BAYLOR
8-0 - Kansas
6-2 - Kansas State, Oklahoma State, Texas Tech
5-3 - Iowa State
3-5 - TCU, Texas, West Virginia
2-6 - Oklahoma
IOWA STATE
7-1 - Kansas
4-4 - Texas Tech
3-5 - Baylor, TCU, West Virginia
2-6 - Texas
1-7 - Kansas State, Oklahoma, Oklahoma State
KANSAS
1-7 - Iowa State, TCU, Texas, Texas Tech, West Virginia
0-8 - Baylor, Kansas State, Oklahoma, Oklahoma State
KANSAS STATE
8-0 - Kansas
7-1 - Iowa State, Texas Tech
4-4 - Oklahoma State, TCU, West Virginia
3-5 - Oklahoma, Texas
2-6 - Baylor
OKLAHOMA
8-0 - Kansas, Texas Tech, West Virginia
7-1 - Iowa State, Oklahoma State, TCU
6-2 - Baylor
5-3 - Kansas State, Texas
OKLAHOMA STATE
8-0 - Kansas
7-1 - Iowa State
6-2 - Texas Tech, West Virginia
5-3 - TCU, Texas
4-4 - Kansas State
2-6 - Baylor
1-7 - Oklahoma
TCU
7-1 - Kansas
6-2 - Texas
5-3 - Baylor, Iowa State
4-4 - Kansas State, Texas Tech, West Virginia
3-5 - Oklahoma State
1-7 - Oklahoma
TEXAS
7-1 - Kansas
6-2 - Iowa State, Texas Tech
5-3 - Baylor, Kansas State
4-4 - West Virginia
3-5 - Oklahoma, Oklahoma State
2-6 - TCU
TEXAS TECH
7-1 - Kansas
4-4 - Iowa State, TCU
3-5 - West Virginia
2-6 - Baylor, Oklahoma State, Texas
1-7 - Kansas State
0-8 - Oklahoma
WEST VIRGINIA
7-1 - Kansas
5-3 - Baylor, Iowa State, Texas Tech
4-4 - Kansas State, TCU, Texas
2-6 - Oklahoma State
0-8 - Oklahoma
REGULAR SEASON RECORDS AGAINST BIG 12 OPPONENTS SINCE 2012 (CURRENT CONFERENCE MEMBERSHIP)
COMBINED
1. Oklahoma 61-11 (.847)
2. Oklahoma State 44-28 (.611)
3. Baylor 42-30 (.583)
3. Kansas State 42-30 (.583)
5. Texas 41-31 (.569)
6. TCU 39-33 (.542)
7. West Virginia 36-36 (.500)
8. Iowa State 25-47 (.347)
8. Texas Tech 25-47 (.347)
10. Kansas 5-67 (.069)
BAYLOR
8-0 - Kansas
6-2 - Kansas State, Oklahoma State, Texas Tech
5-3 - Iowa State
3-5 - TCU, Texas, West Virginia
2-6 - Oklahoma
IOWA STATE
7-1 - Kansas
4-4 - Texas Tech
3-5 - Baylor, TCU, West Virginia
2-6 - Texas
1-7 - Kansas State, Oklahoma, Oklahoma State
KANSAS
1-7 - Iowa State, TCU, Texas, Texas Tech, West Virginia
0-8 - Baylor, Kansas State, Oklahoma, Oklahoma State
KANSAS STATE
8-0 - Kansas
7-1 - Iowa State, Texas Tech
4-4 - Oklahoma State, TCU, West Virginia
3-5 - Oklahoma, Texas
2-6 - Baylor
OKLAHOMA
8-0 - Kansas, Texas Tech, West Virginia
7-1 - Iowa State, Oklahoma State, TCU
6-2 - Baylor
5-3 - Kansas State, Texas
OKLAHOMA STATE
8-0 - Kansas
7-1 - Iowa State
6-2 - Texas Tech, West Virginia
5-3 - TCU, Texas
4-4 - Kansas State
2-6 - Baylor
1-7 - Oklahoma
TCU
7-1 - Kansas
6-2 - Texas
5-3 - Baylor, Iowa State
4-4 - Kansas State, Texas Tech, West Virginia
3-5 - Oklahoma State
1-7 - Oklahoma
TEXAS
7-1 - Kansas
6-2 - Iowa State, Texas Tech
5-3 - Baylor, Kansas State
4-4 - West Virginia
3-5 - Oklahoma, Oklahoma State
2-6 - TCU
TEXAS TECH
7-1 - Kansas
4-4 - Iowa State, TCU
3-5 - West Virginia
2-6 - Baylor, Oklahoma State, Texas
1-7 - Kansas State
0-8 - Oklahoma
WEST VIRGINIA
7-1 - Kansas
5-3 - Baylor, Iowa State, Texas Tech
4-4 - Kansas State, TCU, Texas
2-6 - Oklahoma State
0-8 - Oklahoma