The former World No. 1, who began the year by winning the Sydney International and reaching the semi-finals of the Australian Open, became the second player to announce her participation behind Caroline Garcia of France, the winner of the first edition of the tournament in 2016, reports Efe.
"I am really excited to play the Mallorca Open 2018," said Kerber. "I love the island of Mallorca and the beautiful grass courts in Santa Ponsa in which I had the chance to prepare for Wimbledon last year."
Kerber, 30, ninth in this week's WTA rankings, enjoyed her best season in 2016, beating Serena Williams of the US to secure her first Grand Slam title at Melbourne and claiming an Olympic silver in Río de Janeiro.
From there she went on to clinch her second Grand Slam title at the US Open and was World No. 1 for 20 weeks.
The competition takes place from June 18 to 24.
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