It's safe to say no one knew exactly what the Milwaukee Brewers were getting when they acquired outfielder Christian Yelich from the Miami Marlins 18 months ago.

About all anyone knew was that Yelich, though only 25, already had five years of major-league experience and had hit .297 with 95 home runs. Still, few suspected that he and the Brewers would be a match made in baseball heaven.

In just a season and a half in Milwaukee, Yelich has hit .329 with 65 home runs. He was the National League MVP last season and, since the 2018 All-Star break, has been the best player in the game. Thursday, he was the leading vote-getter for the 2019 NL All-Star team.

The Yelich deal already ranks as one of the best trades in Wisconsin sports history. With that in mind, here are the 10 best trades made by the state's professional teams over the years. The list is weighted heavily toward trades that altered the trajectory of the franchise and/or brought in a transcendent player for relatively little in return.