St. Louis Cardinals outfielder/slugger Jordan Walker is announced as the fifth confirmed participant in the 2026 Home Run Derby, according to multiple outlets. The Winnipeg Free Press and Yardbarker both report that Walker will compete in the event, making him the latest player to be confirmed for the roster. Yahoo Sports also states that Walker becomes the fifth player officially confirmed, while noting that the other three participants have not yet been announced. The reports do not provide additional details about which players are currently expected to join the field beyond the fact that four positions remain unconfirmed or unannounced at the time of the announcement. No further changes to the list of participants are described in the provided sources. The announcements collectively indicate that the Home Run Derby participant group is still being finalized and that more names are expected before the event begins.