Stan Wawrinka
Raonic suffered a thigh injury in March and returned to the tour after a three-month gap.
The downpours also prevented two-time champion Maria Sharapova from starting her opener against Richel Hogenkamp of the Netherlands.
Stan Wawrinka was knocked out of the Australian Open by unheralded American Tennys Sandgren on Thursday
Harrison and Venus won the Roland Garros men’s doubles for their first time.
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