1991 St. Petersburg Open
It was the third edition of the WTA tournament inaugurated under the title of Virginia Slims of Moscow in 1989 and later known as the Moscow Ladies Open . 
<triplet> Virginia Slims of Moscow <subj> 1989 <obj> point in time <subj> Moscow Ladies Open <obj> instance of <triplet> Moscow Ladies Open <subj> 1989 <obj> inception