You are correct with 'whoever', which is used as the subject of the verb is .
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AnonymousWhomever wins in November may need to act on this pledge early in his presidency. Whomever murdered this patriot used that dumpster to try to cover their tracks. Whomever plays Judson would have to defeat the Eagles twice to claim the title.These are incorrect uses of whomever. They should all be whoever.
AnonymousI've found some sentences beginning with whomever:Whomever wins in November may need to act on this pledge early in his presidency. (fresnobee.com)Whomever murdered this patriot used that dumpster to try to cover their tracks. (washingtontimes.com )Whomever plays Judson would have to defeat the Eagles twice to claim the title. (dailyherald.com)This j