Ursenbacher recorded his best result to date by reaching the semi-finals of the 2017 English Open, defeating former world champion Shaun Murphy along the way; he lost 3–6 to Kyren Wilson. Ursenbacher's form declined after that, however, and he failed to win a single match for the rest of the season, aside from variant event Shoot Out. The next season was hardly an improvement, although Ursenbacher caused a major upset at the 2019 Welsh Open by knocking out tournament favourite Ronnie O'Sullivan in the third round; he lost his next match to Zhao Xintong. After losing his first round qualifying match for the World Championship 4–10 to Jordan Brown, Ursenbacher was left 69th in the season-end rankings, confirming his relegation.