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WordNet
sports commentator

n. an announcer who reads sports news or describes sporting events [syn: sports announcer, sportscaster]

Wikipedia
Sports commentator

In sports broadcasting, a sports commentator (also known as sports announcer, sportscaster or play-by-play announcer; often called shoutcaster in eSports specifically) gives a running commentary of a game or event in real time, usually during a live broadcast, traditionally delivered in the historical present tense. The comments are normally a voiceover, with the sounds of the action and spectators also heard in the background. In the case of television commentary, the commentators are on screen rarely if at all during the event (although they may appear on camera at the start or near the end of the broadcast).