What happened: MLB Central, the High School All-American Game and MLB Tonight: National Pregame Show make up Wednesday's programming in Dyersville, Iowa. The seventh annual high school showcase is airing live on MLB Network for the first time.

Why it matters: The national telecast puts leading prep talent before a wider audience. It opens MLB's two-day return to the Iowa venue ahead of the Aug. 13 major-league event.

What to watch: MLB Tonight's national pregame program will follow the high school game.