2011
After the retirement of Gosch, Horst played on the 2011 FIVB World Beach Volleyball Tour with new partner and beach volleyball rookie Daniel Müllner. Their best showing was a 17th place in the 2011 Beach Volleyball World Championships in Rome.
On October 21, 2011, the pair officially announced their split. Speculation began immediately of an Alexander Horst / Clemens Doppler duo, who also split from his partner on the same day. Horst and Doppler would go on to announce their partnership 2 weeks later.
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