Lone Star Series

The Silver Boot is awarded annually to the winner of the Lone Star Series.

The Lone Star Series (also, Silver Boot Series) is a Major League Baseball rivalry featuring Texas' two major league franchises, the Texas Rangers and Houston Astros. It is an outgrowth of the "natural rivalry" established by MLB as part of interleague play as the Rangers are a member of the American League and the Astros were a member of the National League until 2012.

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During interleague play, the winner of the 6-game series was awarded the Silver Boot. A 30-inch (760 mm) tall display of a size-15 cowboy boot cast in silver, complete with a custom, handmade spur. If the series was split (3-to-3), the winner was the club which scored the most runs over the course of the series.

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In 2013, the Astros joined the American League West with the Rangers and changed their rivalry from an interleague to an intra-division rivalry, the Astros played their first game in the American League against the Rangers on Sunday Night Baseball that season. In 2015, both teams made the playoffs and were in a tight division race during most of the season.