Oona Kauste/Aku Kauste (Hyvinkaa, FIN) lost 7-6 to Dorottya Palancsa/Zsolt Kiss (Budapest, HUN) in the Bronze Medal game at the 2019 WCT Tallinn Masters Mixed Doubles in Tallinn, Estonia. of the 2019 WCT Tallinn Masters Mixed Doubles in Tallinn, Estonia; Oona Kauste/Aku Kauste (Hyvinkaa, FIN) lost 7-6 to Dorottya Palancsa/Zsolt Kiss (Budapest, HUN) in the Bronze Medal game at the 2019 WCT Tallinn Masters Mixed Doubles in Tallinn, Estonia. Kauste/Kauste lost 8-6 to Marie Turmann/Harri Lill (Tallinn, EST) in the semifinals to drop into the third place game. of the 2019 WCT Tallinn Masters Mixed Doubles in Tallinn, Estonia; and won 11-2 over Jayne Stirling/Fraser Kingan (Dumfries , SCO) in the quarterfinals. of the 2019 WCT Tallinn Masters Mixed Doubles in Tallinn, Estonia;
 
Kauste/Kauste finished 4-1 in the 18-team qualifying round. . In their opening game, Kauste/Kauste defeated Irantzu Garcia/Gontzal Garcia (Vitoria-Gasteiz, ESP) 6-5, then went on to lose 7-1 against Liisa Turmann/Andres Jakobson (Tallinn, EST). Kauste/Kauste responded with a 9-5 win over Maria Komarova/Daniil Goryachev (Moscow, RUS). Kauste/Kauste won 8-4 against Bonnie Nilhamn/Paavo Kuosmanen (Zoetermeer, NED), then won 6-3 against Stirling/Kingan in their final qualifying round match.
 
. For week 27 of the event schedule, Kauste/Kauste did not improve upon their best events, remaining at th place on the World Ranking Standings with total points. Kauste/Kauste ranks th overall on the Year-to-Date rankings with points earned so far this season.