Cubs showed off playoff potential with Crosstown series win over postseason-caliber White Sox team

The overwhelming majority of the guys to play for the Cubs aren’t Chicago born and bred, so excuse them for not seeing the Crosstown series against the White Sox as the biggest three days of the year. But for at least the first two nights of this week’s series, they played like it had been circled on their calendars, grabbing a pair of walk-off wins against a first-place team in what could easily be described as a playoff-type atmosphere at Wrigley Field. The Cubs did next to nothing…