Career
She made her Women's Tennis Association Tour main draw debut at the 2005 French Open, losing to sixth-seed Svetlana Kuznetsova in the first round. In 2006, she reached the second round, losing to Russian youngster Maria Kirilenko in straight sets. In 2009, she reached the quarterfinals twice.
In Acapulco and in Bogota (where she was seeded number 6)
In 2011, Johansson reached her first Women's Tennis Association Tour final in Bogotá, losing to Lourdes Domínguez Lino in 3 sets.
In April 2012, as a lucky loser, she reached the semifinals of the Grand Prix Sons of the American Revolution Louisiana Princesse Lalla Meryem in Fès (Marrocco) eventually falling to Laura Pous Tio. Later, in May, she reached for the first time the third round of a major tournament, the French Open, falling to Sloane Stephens.
In July, Johansson reached the finals of the Swedish Open, Bastad losing to Polona Hercog, 6–0 4–6 5–7. Foreign one of her last tournament in the season, Mathilde reached the quarterfinals in Guangzhou, beaten by Hsieh Su-Wei 6–3, 6–0.
Overall in 2012, she fell in the first round ten times.
Singles (13–6)
Doubles (1–2).