In his first full season playing with big blocker Gosch, the results were very positive including ninth-place positions at the Grand Slam in Stavenger, Norway, the Beach Volleyball World Championships in Gstaad, Switzerland and the European Beach Volleyball Championships in Spain. With 2 other 9th-place finishes at open tournaments along with a bronze medal at Åland, Finland, the team of Gosch-Horst was well on its way to olympic qualification.
2008
A disappointing season with no top 10 finishes up until the 2008 Summer Olympics in Beijing, China. In the games, they overcame possible elimination in the lucky loser bracket to post a very solid 5th-place finish in eventually losing to the Brazilian silver medalists, Marcio and Fabio.
2009
A very good season with 7 top 10 finishes and then topping it off with a silver medal at the European Beach Volleyball Championships in Sochi, Russia.
2010
Best finishes in 2010 include a 7th place showing early in the season in Shanghai, and a 4th-place finish in Marseille World Series in July. This in his last season playing with Gosch who would have to retire at the end of the season due to knee complications.
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 21 October 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.
2012
The season started out at the Myslowice Open in Poland. Horst and Doppler placed a solid 7th place to kick off the new season. Between mixed results in the FIVB World Tour and the 2012 CEV European Championships, Horst and Doppler posted a hometown win in Baden, Austria. However, their best success in the 2012 season was grabbing a last-minute spot in the 2012 Summer Olympics qualification round in Moscow on 1 July. The pair had a heartbreaking pool play loss to the Swiss Heuscher/Bellaguarda in the 2012 Summer Olympics, ending their olympic hopes in pool play at 19th place. One week after the Olympics, the Austrian duo rebounded for a silver team medal, beating the season's world champions Gibb/Rosenthal for their best showing on the FIVB tour by an Austrian men's pair ever.
