an announcer who reads sports news or describes sporting events

a announcer on radio or television who specialises in commentating sports events

A sportscaster, sports announcer, or sports commentator is a type of journalist on radio or television who specializes in reporting or commenting on sports events. Sportscasting is often done live, "in real-time". In British English the terms sportscaster and sports announcer are not used; the usual terms are commentator, sports presenter and sports broadcaster.