1990 Lufthansa Cup German Open
Second-seeded Monica Seles won the singles title , snapping world no . 1 Steffi Graf's 66-match winning streak in the final ( 2nd in WTA history behind Martina Navratilova's 74-match winning streak ) . 
<triplet> Steffi Graf <subj> 1 <obj> ranking <triplet> 74-match winning streak <subj> Martina Navratilova <obj> facet of