The Manny Machado Watch continues to dominate all conversation surrounding the trade market, but as the calendar inches closer to the July 31 non-waiver Trade Deadline, a big bullpen arm moved this week -- a possible sign of things to come.
MLB Buzz: Catch up on the latest trade chatter
Kansas City dealt closer Kelvin Herrera to Washington on Monday, giving the Nationals an All-Star-caliber arm to pair with Sean Doolittle at the back end of the bullpen. Last week, we cited relievers Herrera, Zach Britton, Brad Brach and Shane Greene as some of the players whose trade stock was rising, so who has seen their value increase during the past seven days?
Manny Machado, Orioles
Machado certainly hasn't let the trade speculation bother him on the field, where he continues to produce as one of the league's best hitters. The shortstop hit safely in five of six games this week, leaving him with a .304/.369/.554 slash line. The biggest question remains whether any team will step up and pay the steep price being asked by the Orioles for their franchise player and impending free agent.
Potential fits:Phillies, Cardinals
Adam Jones, Orioles
Machado might be getting most of the attention in Baltimore these days, but Jones -- a five-time All-Star and longtime face of the franchise -- has been swinging a hot bat in June (.328/.375/.418), and he might be attractive to a team looking for both a productive outfielder and veteran presence. The 32-year-old is slated to become a free agent at the end of the season.
Potential fit:D-backs

Jed Lowrie, A's
The versatile Oakland infielder is having a strong offensive season -- his 11 home runs and 47 RBIs are putting him on a pace to set career highs in both categories. Lowrie, 34, has played primarily at second base this season, though he's capable of moving around the infield wherever he's needed. Lowrie could be the ultimate utility player/insurance policy for any contender.
Potential fits: D-backs, Braves
Joakim Soria, White Sox
After suffering through a difficult May, Soria regained the closer's job for the White Sox, and he has been nearly perfect in June, going 6-for-6 in save opportunities while not allowing a run in nine appearances. He won't be a ninth-inning option for many contenders, but the 34-year-old would add late-inning depth to most bullpens.
Potential fits: Astros, Cardinals

Shin-Soo Choo, Rangers
Choo turns 36 next month, but while his best days are behind him, the outfielder/DH has shown this season that he can still hit, already launching 13 home runs. Choo's OPS is .919 against right-handers, making him an ideal platoon option for an American League team that has the ability to play him at DH and in the corner outfield spots. Choo has been on fire this month, with his June OPS sitting at 1.054 entering the weekend.
Potential fits: Angels, Twins
Darren O'Day, Orioles
Britton and Brach are obvious trade candidates thanks to their expiring contracts, but the Orioles would probably love to shed O'Day's contract this summer. The right-hander is owed about $5 million over the rest of this season and another $9 million in 2019. He's been excellent since returning from the DL less than two weeks ago, throwing four scoreless innings while giving up one hit with no walks and seven strikeouts.
Potential fits: Giants, Indians
Jurickson Profar, Rangers
The onetime No. 1 prospect in all of baseball, Profar's career hasn't lived up to expectations. The 25-year-old filled in admirably for Elvis Andrus during the starting shortstop's stint on the DL, and Profar has already set career bests with eight homers and 41 RBIs thanks to a strong performance this month. However, Andrus' return leaves Profar as a man without a position. Texas plans to keep Profar in the lineup by moving him around the diamond, but with Andrus and second baseman Rougned Odor firmly planted at their respective positions, the Rangers could deal Profar to address another area on their roster.
Potential fits: D-backs, Phillies
Video: TEX@KC: Hamels strikes out 7, allows 0 earned over 7
Cole Hamels, Rangers
Hamels posted another strong start this week, holding the Royals to one unearned run over seven innings. That outing lowered his ERA to 3.41, while his seven strikeouts kept his ratio at one per inning for the year. Hamels remains one of the few proven starters with postseason experience on the market, and with a number of teams looking to add an arm to the rotation, the Rangers are in a good position to deal.
Potential fits: Yankees, Brewers
J.A. Happ, Blue Jays
Happ continues to be one of the more intriguing names on the trade market, though the Blue Jays haven't committed to selling just yet. Happ is 5-0 with a 2.35 ERA over his past seven outings, holding hitters to a .155 batting average and a .469 OPS in those starts. The 35-year-old is owed about $7 million over the rest of the season, but he's set to become a free agent this fall, making him a strong rental candidate.
Potential fits: Yankees, Mariners
Video: OAK@SD: Treinen K's the side to earn the save in 10th
Blake Treinen, A's
It was only 11 months ago that the Nationals dealt Treinen to Oakland as part of the deal for Doolittle and Ryan Madson, giving up on their onetime closer after a dreadful first half that saw him struggle to the tune of a 5.73 ERA. But the 29-year-old has been simply brilliant this season, successfully converting 16 of 17 save opportunities, including each of his past 15. Treinen has a 1.03 ERA, a sub-1.000 WHIP and 43 strikeouts in 35 innings. With a modest $2.15 million salary and two more years of club control, Treinen could be a sought-after bullpen arm in the coming weeks.
Potential fits: Indians, Astros