The Back End of This Bullpen Is Costing the Phillies Games They Cannot Afford to Lose

Philadelphia went 18-4 in August and built what looked like a survivable cushion heading into September. The rotation story consumed the coverage — Luzardo going down, Wheeler and Sánchez carrying the weight, the waiver claim to patch the fifth spot. Everyone was watching the starting pitchers. Nobody was watching what happened after the sixth inning.

Orion Kerkering's last five appearances produced a 17.55 ERA. His season number sits at 4.18, which was already nothing to celebrate for a reliever in a playoff push. The gap between those two figures — nearly 13-and-a-half runs — is not a slump. That is a different pitcher entirely, one who is currently showing up in high-leverage situations and doing damage the offense cannot consistently undo. The depth chart lists him as the primary reliever by usage, which means this is not a fringe problem. It is a structural one.

The team-wide numbers confirm what Kerkering's line implies. Over the last ten games, Philadelphia has surrendered 5.3 runs per game. Over the 20 games before that, the number was 3.3. A two-run spike in run prevention, sustained across ten games, is not variance — it is a pattern, and it tracks almost exactly to when the bullpen started coming apart. The Phillies went 4-6 in that span and are currently on a two-game losing streak with 13 games left and a playoff seed that remains real but not comfortable.

Here is what makes this particularly dangerous: the rotation has actually held up better than feared after Luzardo's injury. Wheeler has been sharp all season at a sub-3.00 ERA, and Sánchez has been arguably the team's most consistent arm. The starters are doing their job. The problem is what happens when they leave. If a reliever is posting an ERA north of 17 in recent outings and he is still being deployed in meaningful innings, the manager is either running low on options or betting that the underlying talent will reassert itself. Neither is a reassuring explanation with 13 games left.

The offense has the firepower to paper over some of this — Harper, Schwarber, and De La Cruz give this lineup legitimate thunder — but you cannot outscore a bullpen that is actively hemorrhaging leads. The August cushion bought time. Kerkering's September is spending it. The question now is whether Philadelphia can stabilize the back end before the margin disappears entirely, because the math on a six-seed with 13 games remaining leaves very little room for a reliever who is currently the most dangerous arm in the bullpen — to the wrong team.