Cubs-Cardinals rivalry switches to higher gear with Jason Heyward signing

Heyward reportedly chooses division-rival Cubs

Hey, you're fired but can you stick around for a few more months?” “I desperately wish Heyward lived up to the contract” - Chicago Cubs fans react to Jason Heyward and Cubs

So, who do the Cubs have to trade anyway? - by Andy Dolan

Yadier Molina - Wikipedia

Jason Heyward reshapes Cards-Cubs rivalry with one decision

Cubs edge Indians to keep title hopes alive