If you look at teams that are outperforming expectations (i.e. winning more than expected as measured by +units), since around June 10th, the Reds are the best team in MLB and its not even close.
They are +17 units since June 6th.
Bos & Bal are up 9 units over same period.
They are playing exceptionally well. And as many have pointed out, pitching is their achillies heel (20th in ERA, 22 WHIP).