Despite not winning the starting quarterback job before the season, Duggan replaced the injured Chandler Morris in the opener against Colorado. He has passed for 3,321 yards and 30 touchdowns with only four interceptions, and added 404 rushing yards and six touchdowns.

Duggan won two national quarterback awards, the Davey O’Brien and Johnny Unitas Golden Arm, while earning second-team Associated Press All-America honors and being named Big 12 Offensive Player of the Year. He started his first three seasons at TCU under a different coaching staff and has 9,241 career passing yards and 71 touchdowns, along with 1,837 rushing yards and 25 rushing scores. Duggan ranks third in TCU history in both career passing touchdowns and touchdowns responsible for (36), while ranking fourth in completion percentage (64.9).