The 30: Four teams seeking relief in this week's MLB power rankings

With the trade deadline is just one week away, Jonah Keri looks at four teams with one last chance to grab much-needed bullpen help—or in some cases, offer it up.

With just one week to go until the trade deadline, nearly every team in baseball figures to explore the market for one particular asset, either buying or selling it. That asset? Relief pitching.

This week’s four featured teams could all play major roles in that bullpen-swapping bonanza. The Brewers have a loaded ‘pen, which has other teams burning up the phone lines. The Pirates are a team in limbo that could opt to trade their walk-year closer even as they sit on the edge of the playoff race. The Mets have two highly productive…