Alexander Tretyakov made his World Cup debut in November 2004 at a race in Winterberg, in which he was 32 . Two years later he came to Calgary in ninth place for the first time among the top 10. At the 2006 Winter Olympics in Turin, he was ranked 15th international fame he enjoyed in the season 2006/07. After a second place in Calgary and a third place in Park City, he won his first World Cup race in Igls, and shortly thereafter again in Winterberg. At the 2007 World Championships in St. Moritz, he finished fifth. His first title he won shortly thereafter at the European Championships in Koenigssee.
The season 2009/09 should be Tretyakov's best. In Winterberg he already started the season as runner-up. In all races of the season he was never worse than agreed in ninth place. The final two races of the season in Park City won the Russian and won before the two until then the World Cup dominating German Florian Grassl and Frank Rommel the overall standings of the season. The Skeleton Championships 2009 in St. Moritz Tretyakov missed as a Fifth -placed a medal. At the Olympic Winter Games in Vancouver in 2010, he won the bronze medal. In the 2010/11 season Tretyakov won one race, placed five times on the podium and was overall in fifth. At the European Championships in Winterberg, he won bronze at the World Championships in Koenigssee silver. And again he won silver at the European Championships in 2013 and Skeleton at the Skeleton World Cup in 2013 he was first Skeleton World Champion. At the Olympic Winter Games in Sochi in 2014, he became Olympic champion.