Topic summary
Play-by-play

Extracted from the Wikipedia article Sports commentator.
Main/play-by-play commentator
The main commentator, also called the play-by-play commentator or announcer in North America, blow-by-blow in combat sports coverage, lap-by-lap for motorsports coverage, or ball-by-ball for cricket coverage, is the primary speaker and the moderator of the broadcast. Broadcasters in this role clearly describe each play or development as the event unfolds. Because of their skill level, commentators like Al Michaels, Brian Anderson, Ian Eagle, Kevin Harlan, Jim Nantz, and Joe Buck in the US, David Coleman in the UK, and Bruce McAvaney in Australia may have careers in which they call several different sports at one time or another. Other main commentators may, however, only call one sport (Joe Rogan for example announces only one sport which is mixed martial arts, specifically the UFC organization and Peter Drury for the Premier League Football Association). The vast majority of play-by-play announcers are male; female play-by-play announcers had not seen sustained employment until the 21st century.