Hattestad has 11 individual World Cup victories, all in the sprint events. He also won the 2007-08 and 2008-09 World Cup in the sprint discipline and finished third in the overall 2008-2009 world cup.
Hattestad won two gold medals at the 2009 world championships, earning them in the individual and team sprint events. Having ranked sixth in the qualifying round, Hattestad progressed through the quarter finals and semi finals by winning each round, eventually taking the title ahead of fellow Norwegian Johan Kjølstad. The subsequent day, the two of them teamed up for the team sprint and won another gold medal.