What is the official sponsored name of MLB's Home Run Derby?

The official sponsored name of MLB's Home Run Derby is the T-Mobile Home Run Derby. T-Mobile's naming rights connect the company with one of the headline events of Major League Baseball's All-Star Week.

The Home Run Derby is a power-hitting competition in which selected major-league sluggers try to hit as many home runs as possible. It is separate from the All-Star Game, although both events are held during the same midsummer baseball celebration. The competition has used several formats over time, including timed rounds and bracket-style advancement.

The event began in 1985 and has become one of baseball's most recognizable annual showcases. Players compete individually rather than as members of opposing teams, so the focus is on distance, launch angle, and total home runs.

A common mix-up is treating the Derby as simply the “MLB Home Run Derby” in every official context. MLB often uses that shorter description editorially, but the sponsored event branding includes T-Mobile. Nike, Pepsi, and Capital One are not the official title sponsors of the Derby.