From Longman Dictionary of Contemporary Englishunseededun‧seed‧ed /ˌʌnˈsiːdɪd◂/ adjective DSTnot chosen as a seed (=someone with a numbered rank in a competition), especially in a tennis competition
Examples from the Corpus
unseeded• Despite her success last year, Julie is unseeded.• Larsson will play unseeded Wally Masur in the final eight. 