Kaeser qualified for the men's 200 m breaststroke at the 2012 Summer Olympics in London, by breaking a long-course Swiss record and eclipsing a FINA B-cut of 2:12.09 from the
European Championships in Debrecen, Hungary. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ Kaeser rounded out the field to last place by more than a second behind Hungary's Ákos Molnár in 2:13.49. Kaeser failed to advance into the semifinals, as he placed twenty-fourth overall in the preliminary heats. Kaeser failed to advance into the semifinals, as he placed twenty-fourth overall in the preliminary heats.