is the grammar in this news headline correct?

luz

New member
"Zenyatta, first female horse to win Breeders' Cup Classic, is favorite to repeat, stay undefeated"

I'm wondering about "stay", shouldn't it be "stays"? and also the synthaxs of the sentences looks funny to me. Is it because it's "news" language and generally accepted?
thanks for your help, I'm not a native speaker...
 
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