Infielder Jack Walker, a four-year starter at Concordia University Chicago, was selected by the Washington Nationals on Wednesday with the first pick of the 20th round (592nd overall).

Walker, a Naperville North graduate, was a career .352 hitter at Concordia, good for fourth on the school's all-time list. He's the program's career leader in five categories, including games played (176), hits (235) and runs scored (211).