Hammer is five-times a champion (2006, 2007, 2010, 2011 & 2013) in the individual pursuit and twice a champion (2013 & 2014) in the
omnium at the
UCI Track Cycling World Championships. At the
2008 Summer Olympics, Hammer finished fifth overall in the individual pursuit and did not finish in the points race. At the
2012 Summer Olympics, Hammer won a team silver medal in the
Women's team pursuit, as well as an individual silver medal in the
women's omnium. Hammer held the
world record in the 3000 m individual pursuit from 2010 until it was broken by
Chloé Dygert in 2018. Hammer announced her retirement from professional Cycling on September 23, 2017. ==Major results==