A WTA spokesperson said: "Following the announcement of the WTA Tour suspension through July 12, the WTA events in Bastad, Lausanne, Bucharest, and Jurmala scheduled for July will not be held, due to the ongoing COVID-19 pandemic.
"We regret this is the case but will continue to be guided by medical experts for when it is safe and possible to return to WTA competition. We continue to monitor the situation closely and are hopeful to be back on the court as soon as possible.
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"A decision regarding the dates in which Karlsruhe and Palermo may be played along with further updates to the WTA calendar will be made in June."