Theresa Breen (Halifax, NS) lost 7-4 to Jill Brothers (Halifax, NS) in the Final of the Dave Jones Stanhope Simpson Insurance Mayflower Cashspiel, held October 26 - 29, 2017 at the Mayflower Curling Club in Timberlea, Canada. To advance to the championship game, Breen won 5-3 over Jennifer Armstrong (Fredericton, NB) in the semifinals of the 2017 Dave Jones Stanhope Simpson Insurance Mayflower Cashspiel in Timberlea, Nova Scotia, Canada; and won 5-3 over Mary-Anne Arsenault (Halifax, NS) in the quarterfinals. of the 2017 Dave Jones Stanhope Simpson Insurance Mayflower Cashspiel in Timberlea, Nova Scotia, Canada;
 
Breen finished 3-1 in the 15-team qualifying round. . In their opening game, Breen defeated Mary Mattatall (Halifax, NS) 7-4, then won 7-6 against Cassandra Lewin (Carp, ON). Breen went on to lose 7-5 against Arsenault. Breen responded with a 5-4 win over Veronica Smith (Charlottetown, PEI) in their final qualifying round match.
 
With their runner-up finish at the Dave Jones Stanhope Simpson Insurance Mayflower Cashspiel, Breen take home 17.095 world rankings points along with the $2,000CDN prize, moving up 3 spots the World Ranking Standings into 50th place overall with 100.607 total points. Breen ranks 42nd overall on the Year-to-Date rankings with 38.620 points earned so far this season.