This was Washington State's fourth appearance in the Holiday Bowl, having lost to #14 Brigham Young in 1981, having defeated #5 Texas in 2003, and having lost to Minnesota in 2016. The Cougars finished the 2017 regular season at 9–3, and were third in the Pac-12 North Division (6–3). The season featured wins against then-#5 USC and then-#18 Stanford.
Michigan State
This was Michigan State's first appearance in a Holiday Bowl. The Spartans finished the 2017 regular season at 9–3, and were second in the B1G East Division (7–2). The team had upset wins over then-#7 Michigan and then-#7 Penn State. Their three losses were all against teams that finished in the AP Top 20 (#14 Notre Dame, #20 Northwestern and #5 Ohio State).
^"MICHIGAN STATE AND WASHINGTON STATE ANNOUNCED IN TOP 20 MATCH-UP FOR 40TH ANNUAL SDCCU HOLIDAY BOWL". Holiday Bowl. December 3, 2017. Archived from the original on December 5, 2017. Retrieved December 4, 2016.