Kathryn Mercer (Cleveland, OH) lost 11-3 to Merlin Howick (Houston, TX) in the Final of the USA Arena National Women's Curling Championship, held May 5 - 11, 2019 in West Chester, Pennsylvania. To advance to the championship game, Mercer won 8-6 over Katie Feldman (Sacramento, CA) in the semifinals of the 2019 USA Arena National Women's Curling Championship in West Chester, Pennsylvania; and won 10-6 over Heather Semenuik (Napierville, IL) in the quarterfinals. of the 2019 USA Arena National Women's Curling Championship in West Chester, Pennsylvania;
 
Mercer finished 4-0 in the 0-team qualifying round. . In their opening game, Mercer defeated Emily Martinelli (Las Vegas, NV) 12-8, then won 10-2 against Diane Palme (Woodside, CA) and 9-5 against Allison Donaldson (Dallas-Fort Worth, TX). Mercer won 8-7 against Helen Bryce (Cedar Rapids, IA) in their final qualifying round match.
 
. For week of the event schedule, Mercer did not improve upon their best events, remaining at th place on the World Ranking Standings with total points. Mercer ranks th overall on the Year-to-Date rankings with points earned so far this season.