[1] She made her WTA Tour main-draw debut at the 2005 French Open, losing to sixth-seed Svetlana Kuznetsova in the first round.

[1] In April 2012, as a lucky loser, Johansson reached the semifinals of the Grand Prix in Fès (Morocco), eventually falling to Laura Pous Tio.

Later in May, at the French Open, she reached for the first time the third round of a major tournament, falling to Sloane Stephens.

In July, Johansson reached the finals of the Swedish Open, losing to Polona Hercog, in three sets.

In 2016, Johansson decided to retire after the French Open singles qualifying tournament where she was beaten in the second round by Ivana Jorović.