 In 2009–10, Markström led the Elitserien in the save percentage (SVS%) and goals against average (GAA) statistics, with 92.72% and 2.01 respectively.On 1 June 2010, it was announced that the Panthers and Markström had agreed to terms on an entry-level contract.On 23 January 2011, Markström made his NHL debut at the Prudential Center in Newark when he replaced starter Scott Clemmensen at the start of the second period in a loss against the New Jersey Devils.