Katie Cottrill/Shawn Cottrill (Listowel, ON) qualified for the 2018 Listowel Mixed Doubles Cashspiel playoffs, dropping their quarterfinals match 8-7 against Catherine Liscumb/Chris Liscumb (Ilderton, ON). of the 2018 Listowel Mixed Doubles Cashspiel in Listowel, Ontario, Canada;
 
Cottrill/Cottrill finished 2-1 in the 24-team qualifying round. . In their opening game, Cottrill/Cottrill defeated Brenda Edger/Lorne Koch (Vanastra, ON) 9-6, then went on to lose 9-6 against Brianne Donegan/Sam Steep (Listowel, ON). Cottrill/Cottrill responded with a 9-8 win over Jessica Shipmaker/Craig Shinde (Mississauga, ON) in their final qualifying round match.
 
. For week 28 of the event schedule, Cottrill/Cottrill did not improve upon their best events, remaining at th place on the World Ranking Standings with total points. Cottrill/Cottrill ranks th overall on the Year-to-Date rankings with points earned so far this season.