The
2005–06 season was Svendsen's first season on the
World Cup tour. Previously, he had competed as a junior in the European Cup, now known as the IBU cup. During his first season in the World Cup, Svendsen finished fifth in three races, two of them in sprints (
Brezno-
Osrblie and
Ruhpolding), and the other in a mass start (
Holmenkollen). He also finished races in seventh, ninth, and four more within the top twenty (14th, 15th, 17th, 19th). He finished the overall season in 22nd place. He was 32nd in the pursuit, 21st in the sprint, and 7th in the mass start, only seven points behind
Sven Fischer in fourth place. Svendsen was selected for the
Olympics, to compete in the mass start, in which he came sixth, after hitting 18/20 targets and finished 53.8 seconds behind winner
Michael Greis of
Germany. As a junior, Svendsen won four gold medals in junior World Championships, his first and second gold was in the pursuit, and the relay in
Haute Maurienne in 2004, and the third and fourth gold in the individual and the sprint in
Kontiolahti in 2005. He also has two bronze medals from the individual and the pursuit in
Kościelisko in 2003. During his three seasons in the European Cup, Svendsen won two races (individual and pursuit), one second place (sprint), and came third three times (all in the sprint). For his first season in the World Cup Svendsen had an 82% shooting average, making him the 42nd best shot of the tour, but the same shooting percentage as
Halvard Hanevold and
Vincent Defrasne. He hit 243 out of 295 targets. He shot both 82% in his prone and standing shoot, he averaged 70% in the individual, 84% in the sprint, 81% in the pursuit, 87% in the mass start, and 76% in the relay. On 13 December 2007, Svendsen took his first world cup victory, at the 20 km in Pokljuka. However, his big breakthrough came when he won two individual gold medals at the 2008 World Championships, winning both the individual and the mass start ahead of
Ole Einar Bjørndalen. He went on winning more victories and podiums for the rest of the season, and eventually finished third overall. The 2008/2009 season started off well for Svendsen. By placing on the podium in every one of the first five races, he took the lead in the overall world cup. After the Christmas holiday however, Svendsen struggled to maintain the early season's results, and when he fell ill during the world championships and did not compete in several races, he lost the overall lead. After a couple of middle placings, he returned with a third place at the mass start event in Trondheim, and a fourth place and a victory in Khanty Mansiysk the consecutive week. , 2010 He won a silver medal in the
10 km sprint at the
2010 Winter Olympics in
Vancouver on the first day of men's biathlon competition and then followed it up with two gold medals in the
20 km individual and the relay event. He won 2 gold medals in
2014 Winter Olympics: in
mass-start and
mixed relay (together with
Ole Einar Bjørndalen,
Tiril Eckhoff and
Tora Berger). Svendsen is (185 cm) tall, and weighs 170 lb (77 kg, ) On 9 April 2018, he announced his retirement from biathlon following the 2017–2018 season. ==Personal life==