Baseball’s trade deadline is less than two weeks away, and if you thought we’d know by now exactly who’s buying and who’s selling, then you really haven’t been paying attention to this season full of teams stuck in the middle.With the expanded playoffs and an abundance of American League mediocrity, only eight teams entered this week with less than 10 percent playoff odds on FanGraphs (and one of those, the Washington Nationals, had hit enough to remain in the wild-card conversation despite their long odds of actually advancing).So, there are relatively few sellers, and only a handful of buyers who are in position to be particularly aggressive — at least for now. Things can change in a hurry (just ask the suddenly red-hot Boston Red Sox).Here, then, is our second attempt to group all 30 teams into seven trade tiers. And there’s been some movement since we last tried this exercise three weeks ago.Tier 1: Could be (should be?) aggressive buyersTeamNeedsYankeesRP, 3B, CBrewersSP, RP, IFPhilliesRF, RPCubsSP, RPPiratesOF, RPTwo types of teams should aggressively buy at the deadline: teams with a legitimate chance to win a championship and teams on the fringes of contention who could use a major boost to get to the postseason.Our top four teams here fit the first category. The Yankees should see a mediocre American League as an opportunity for a second pennant in three years; Aaron Judge’s uncertain injury status applies more pressure to do something at the deadline to chase down the Rays in the AL East. The Brewers look even stronger than they did last year, when they finished the year with baseball’s best record. A major addition could be the difference in taking down the Dodgers.The Phillies and Cubs are a step below Milwaukee right now but are facing a time crunch with their rosters. This might be their best chance to win in the next few seasons.And then there’s the Pirates, who fit our latter qualification to buy aggressively. Pittsburgh is in the thick of the race for the third wild card with Miami and Arizona. Unlike the Diamondbacks, the Pirates own a sparkling run differential and third-order winning percentage. Unlike the Marlins, their playoff drought runs more than a decade. Unlike both, they have the ticking clock of Paul Skenes’ team control. Buying big at the deadline could get the Buccos to October.Tier 2: Typical buyersTeamNeedsDodgersRPBravesSPRaysSP, OF, CMarinersRHB, RPGuardiansRHBThese teams all possess postseason odds of at least 70 percent and legitimate chances to win their respective divisions. (Only Cleveland isn’t currently in first place, and it’s just a percentage point behind the White Sox.) You can make a case here for each team to be especially aggressive at the deadline to affect its chances of actually winning a championship. But adding the one or two pieces they need to solidify a berth in the postseason is the bare minimum.Tier 3: Trending to the buy sideTeamNeedsRangersRPRed SoxIF, RPWhite SoxSP, RPMarlinsOF, CIF, SPDiamondbacks1B, SP, RPTwinsSP, RPOriolesSP, OFAstrosOF, SPOoh boy, it’s a big group this time around. The Rangers and White Sox lead their respective divisions, and we get it if you think they should be typical buyers. But Texas is just above .500, and Chicago is ahead of schedule, so we’re being a little bit cautious with them 10 days out.