At Kauffman Stadium, the Minnesota Twins beat the Kansas City Royals, 13 – 7, as both teams each hit three consecutive home runs in the same game for the first time in major league history. Ron Coomer, Jacque Jones and Matt LeCroy connect consecutively in the 6th inning for Minnesota, followed by three in a row by Carlos Beltran, Jermaine Dye, and Mike Sweeney of Kansas City two innings later.

This Day In Baseball

On April 9, 2000 — At Kauffman Stadium, the Minnesota Twins beat the Kansas City Royals, 13 – 7, as both teams each hit three consecutive home runs in the same game for the first time in major league history. Ron Coomer, Jacque Jones and Matt LeCroy connect consecutively in the 6th inning for Minnesota, followed by three in a row by Carlos Beltran, Jermaine Dye, and Mike Sweeney of Kansas City two innings later.

Source
Baseball Reference April 9