Cubs struggle against winning teams, raising playoff concerns as Brewers close in with strong June.

The Chicago Cubs, with a 13-13 record in June, have struggled against teams with winning records, not securing a series win since April against the Los Angeles Dodgers. This performance raises concerns as they compete in a tight National League Central division race, where the Milwaukee Brewers are closing in after a strong June with a 16-9 record. The Cubs need to improve to maintain their playoff hopes.