The team with the worst record in MLB at the moment is Milwaukee, who is 2.5 games behind the Phillies.
MLB Standings
The Phillies do still have the worst run differential in MLB (-56), as well as the worst pythagorean projection, at 17-30.
After a hot start the Mets have cooled off significantly:
Even so, it remains to be seen whether any of the other three teams in the division have enough to overtake them.