Chiaki Matsumura/Yasumasa Tanida (Nagano/Hokkaido, JPN) lost 7-5 to Tori Koana/Go Aoki (Karuizawa, JPN) in the Final of the Mixed Doubles Super Series - Oakville, held December 28 - 31, 2023 at the Oakville Curling Club in Oakville, Canada. To advance to the championship game, Matsumura/Tanida won 6-4 over Cory Thiesse/Korey Dropkin (Duluth, MN) in the semifinals of the 2023 Mixed Doubles Super Series - Oakville in Oakville, Ontario, Canada; and won 8-7 over Kristin Moen Skaslien/Magnus Nedregotten (Oslo, NOR) in the quarterfinals. of the 2023 Mixed Doubles Super Series - Oakville in Oakville, Ontario, Canada;
 
Matsumura/Tanida finished 4-1 in the 24-team qualifying round. . In their opening game, Matsumura/Tanida defeated Anne Sophie Gionest/Robert Desjardins (Chicoutimi, QC) 10-6, then went on to lose 10-4 against Alina Paetz/Sven Michel (Zurich, SUI). Matsumura/Tanida responded with a 8-3 win over Riley Sandham/Brendan Craig (Guelph, ON). Matsumura/Tanida won 9-6 against Therese Westman/Robin Ahlberg (Stockholm, SWE), then won 8-2 against Megan Smith/Doug Thomson (Newmarket, ON) in their final qualifying round match.
 
With their runner-up finish at the Mixed Doubles Super Series - Oakville, Matsumura/Tanida take home 38.500 world rankings points along with the $4,000CDN prize. For week 23 of the event schedule, Matsumura/Tanida did not improve upon their best events, remaining at 4th place on the World Ranking Standings with 143.532 total points. Matsumura/Tanida ranks 4th overall on the Year-to-Date rankings with 77.250 points earned so far this season.