Danny Woodrow and Chad Sedio each had three hits to lead West Michigan in Game 1, while Trent Szkutnik picked up his fifth win of the season.
In Game 2, the Whitecaps were limited to four hits and were shut out in the loss. David Gonzalez paced West Michigan with two hits.
Starting pitcher Alfred Gutierrez took the loss in Game 2, tossing 5 and 2/3 innings and surrendering two runs on three hits.
West Michigan which is 64-29 on the year and in first place of the Midwest League Eastern Division second half with a 19-7 record, will close out its series at Beloit with the rubber match on Friday at 8 p.m.