The Chicago Cubs on Friday began a stretch of 14 games in 17 days against the Milwaukee Brewers and St. Louis Cardinals, facing off against the two teams battling for the National League Central crown. It’s a chance for David Ross’s team to prove its recent run of success is no fluke and for the Cubs to have some say in a race they’ve been out of since falling nine games on May 8. “We’re going to find out what we’re made of,” second baseman Nick Madrigal said.