2017 Wolffkran Open
The 2017 Wolffkran Open was a professional tennis tournament played on carpet courts . 
<triplet> 2017 Wolffkran Open <subj> tennis <obj> sport <triplet> Wolffkran Open <subj> tennis <obj> sport <subj> carpet courts <obj> surface played on <triplet> carpet courts <subj> tennis <obj> sport