What It Means:

The Nationals have also expressed interest in the White Sox's David Robertson, so it looks like they plan on adding a closer by the trade deadline. Meanwhile, Herrera's market value is higher now than it will be this winter and the Royals figure to be midseason sellers. At least on paper, a deal seems to make sense.

Herrera has converted on three of his four save chances this season while recording a 2.70 ERA, 0.80 WHIP and 18.9 strikeout percentage across 10 innings.