Per MLBTR on option:
Herrera’s third-year option is valued at $10MM with a $1MM buyout, tweetsBruce Levine of CBS Chicago / 670 The Score. That indicates that Herrera will earn $17MM between the first two seasons of the deal, with the buyout making up the remainder of that $18MM guarantee. The exact terms of the vesting option remain unclear, though Levine notes that Herrera will need to be healthy in both 2019 and 2020 for it to vest, so it’s likely a combined number of innings pitched or appearances that’ll trigger the third year. As with all vesting options, it’ll revert to a straight club option if Herrera does not meet the designated criteria.