The second half of August brings an uptick in waiver placements. Beyond the trade deadline, waivers are the only real option for player movement from one team to another. A few teams that were fringe contenders at the end of July know now that they're almost certainly going to miss the postseason. Placing veterans with semi-notable salaries on waivers gives them a chance to dump the final few weeks of a contract. Other teams aren't going to claim a terrible contract, but there's sometimes a balance where the player's salary is solid value but isn't of much use to a team that is going to miss the playoffs anyway.
This can take on added importance for teams that are right up against the luxury tax. The Angels kicked this practice into gear two years ago, offloading Lucas Giolito, Reynaldo López and Matt Moore to slide narrowly below the CBT threshold. That at least allowed them to recoup a better draft pick when Shohei Ohtani walked in free agency. It's not only about tax avoidance, though. A lot of teams would welcome the opportunity just to cut a few hundred thousand dollars off the books in a losing season.
Within the past week, Rangers righty Jon Gray has already gone unclaimed on waivers. He was subsequently placed on the injured list due to thoracic outlet syndrome and will probably remain on the IL for the rest of the season. Marlins starter Cal Quantrill hit waivers within the past day or two; it's to be seen whether another team will pick up the approximate $734K that he's owed through season's end. Waiver placements that are not preceded by a DFA aren't publicly announced by teams. They're often leaked to reporters, but it's entirely possible there have already been a few notable names who have cleared or are on waivers that haven't gotten out.
The late-August timing isn't coincidental. Players must be in an organization by the start of September to be eligible for postseason play. Teams can still go the waiver route in September, but other clubs are less likely to place a claim next month because those players cannot help in the playoffs. Waiting until the end of August gives the current team as much time as possible to see where they're at in the standings. It also reduces the cost to a potential claiming team to around four weeks of salary, perhaps making someone more likely to place a claim at the end of the month than they would have been a few weeks ago (when the remaining salary would be around twice as high).
It's worth reiterating that the teams placing the player on waivers are hoping another team makes a claim. Sending a veteran through unclaimed has little to no benefit. Most of them have the five-plus service years to refuse a minor league assignment, so teams usually proceed as if nothing happened if the player goes unclaimed. They could place them back on waivers in a week or two to see if another club is more willing to bite because of the lower remaining salary and/or intervening injuries.
Which players could find themselves on waivers within the next 10 days? There's a clear team with which to start -- a club that bought at the deadline but has been in a free fall ever since while they sit right against the luxury line.

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