He played four seasons of Major League Baseball as a utility infielder for the New York Yankees and California/Anaheim Angels.

On September 27, 1997,[1] Eenhoorn became the first Dutch-born player to hit a home run in the Major Leagues since Jack Lelivelt in 1912.

All other Dutch MLB players to have hit home runs were born elsewhere, mainly in the country's Caribbean territories, most notably the Curaçao natives Andruw Jones and Hensley Meulens.

His father played baseball during World War II as an act of Dutch rebellion against the German occupation.

[6] Eenhoorn played for Neptunus and Haarlem Nicols in the Dutch Honkbal Hoofdklasse, the highest level of professional baseball in the Netherlands, from 1984 through 1990.

[9] Eenhoorn was named the third-team All-American shortstop by Baseball America in 1990 while attending Davidson College in North Carolina.

Eenhoorn began his professional career with the pennant-winning Class-A Oneonta Yankees in the New York–Penn League and hit .268/.324/.355.

He was voted to the League All-Star team as a utility infielder and was labeled a "defensive genius" by Baseball America.

[11][12] In 1991, Eenhoorn hit .350/.395/.575 for the Gulf Coast League Yankees and .241/.320/.343 for the Class-A Advanced Prince William Cannons.

[19] All three seasons, Neptunus was most successful on a national level, since it both won in the Hoofdklasse (Dutch Major League) and the Holland Series.

[25] On November 11, 2011, Eenhoorn was knighted on the order of Queen Beatrix, after he led the Dutch team to the 2011 Baseball World Cup title in his role as technical director.