Heading into the 2018–19 curling season, Pätz joined forces with Silvana Tirinzoni, who would skip the team, but Pätz would throw fourth rocks, with Esther Neuenschwander at second and Melanie Barbezat throwing lead rocks. The team reached the final in the first Grand Slam of the season, the Elite 10. They represented Switzerland at the 2018 European Curling Championships, claiming the silver medal. They were unbeaten in the round robin, winning nine games, defeated Germany 6–4 in the semi-final, and lost 5–4 to Sweden's Anna Hasselborg in the final. Having won the 2019 Swiss National Championships, the team represented Switzerland at the 2019 World Women's Curling Championship in Silkeborg, Denmark. The team went 2–3 in their first five games, then won six games in a row to secure their playoff spot. They went on to finish the round robin with a 8–4 record and in fourth place in the standings. They defeated China in the qualification game and South Korea in the semi-final to set up a repeat of the European Championship final against Hasselborg and Sweden. The result was reversed, with Pätz making a draw to the four-foot in the extra end for an 8–7 win to become the 2019 world champions. The team capped off their year by winning their first Grand Slam title together at the Champions Cup and reaching the final of the inaugural Curling World Cup.