Katie Cottrill/Shawn Cottrill (Belgrave, ON) run at the 2018 Southern Mixed Doubles came to an end in the semifinals with a 6-4 loss to Courtney Shaw/Melvin Shaw (Washington, DC). of the 2018 Southern Mixed Doubles in Charlote, North Carolina, United States; Cottrill/Cottrill advanced through the quarterfinals with a 7-1 win over Stacey MacNeil/Brady Gould (Charlotte, NC).
 
Cottrill/Cottrill finished 2-2 in the 24-team qualifying round. . In their opening game, Cottrill/Cottrill defeated Katrina Friedman/Adam Friedman (Charleston, SC) 7-0, then went on to lose 8-5 against Audrey Foote/Guy Davis (Utica, NY). Cottrill/Cottrill responded with a 9-0 win over Dawn Hozjan/Jeremy Hozjan (Charlotte, NC). Cottrill/Cottrill went on to lose 0-0 against MacNeil/Gould in their final qualifying round match.
 
. For week 20 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.