Like the stock market, the trade market seems to fluctuate daily. With every dominant -- or woeful -- performance, every injury and every day that gets crossed off the calendar, the needs of buyers and sellers seem to sway like the flags flying high atop Wrigley Field.
With less than seven weeks to go until the July 31 non-waiver Trade Deadline, here's a look at 10 players whose stock is on the rise.
Manny Machado, SS, Orioles
Machado was already the top prize of the trade season, but the Orioles' shortstop is in the midst of the best year of his career. Machado's breakout comes at a perfect time for him as he heads toward free agency, not to mention for the O's, who will likely land a nice package of prospects for the All-Star rental. The question isn't if he'll be traded, but when and to whom? And will Machado's next team ask him to move back to third base?
Potential fits: Braves, Phillies
• MLB Buzz: Machado trade value more as 3B?

Tyson Ross, RHP, Padres
The right-hander is having a solid season, posting a 3.51 ERA in 14 starts. For those wondering how much Petco Park might play into Ross' numbers, consider that his 3.67 home ERA is higher than his 3.40 road mark. Equally appealing is his $1.75 million contract, making him a huge bargain in a shallow starting pitching market.
Potential fits: Yankees, Giants

Kelvin Herrera, RHP, Royals
Has there been a better reliever in the game than Herrera this season? Royals general manager Dayton Moore said this week that he won't trade away popular players simply for the sake of making a deal, but given the haul that teams have landed for relievers the past few summers, it would be a shock if Herrera -- who has a 1.05 ERA and a 0.82 WHIP -- wasn't traded.
Potential fits: Cardinals, Astros

Shane Greene, RHP, Tigers
The Tigers' season took another turn for the worse when Jose Cabrera was lost for the year with a torn left biceps, so it wouldn't be a surprise to see Detroit shift into sell mode. The rebuild began last summer, with trades of Justin Verlander, Justin Upton and J.D. Martinez, among others, so while Greene doesn't necessarily rate with those guys, he's established himself as a legitimate late-inning option.
Potential fits: Indians, Angels

Zach Britton, LHP, Orioles
The Orioles' closer returned from the disabled list this week after missing the first two-plus months following right Achilles surgery. Unfortunately for the left-hander, he rejoins a team nearly 30 games under .500 and hopelessly out of the postseason picture. Britton, a free agent after the season, could be a worthy risk/reward trade candidate if he regains his previous dominant form.
Potential fits: Astros, Cardinals

Mike Moustakas, 3B, Royals
Following an offseason during which he struggled to find a home as a free agent, Moustakas has performed well for the Royals. Kansas City will be a sure-fire seller in the weeks ahead, and given that Moustakas can't be extended a qualifying offer at the end of the season, it would be peculiar for the Royals not to trade him for a prospect if the opportunity arises.
Potential fits: Braves, Cardinals

Cole Hamels, LHP, Rangers
The veteran lefty has pitched better than his 3-6 record this season might suggest, posting a 3.69 ERA with 85 strikeouts over 85 1/3 innings. Hamels had strong back-to-back outings last month against the Astros and Yankees, though he's been knocked around in two of his past four starts. Still, in a weak pitching market, a 34-year-old former ace with vast postseason experience will be in demand.
Potential fits: Yankees, Brewers

Brad Brach, RHP, Orioles
Brach successfully converted seven of eight save opportunities after regaining the closer role in early May, proving himself a capable late-inning option. With Britton back from a lengthy DL stint, Brach will return to setup duties, though his recent performances -- combined with the fact that he's set to become a free agent after the season -- should give him an opportunity to be traded and contribute to a contender down the stretch.
Potential fits: Rockies, Angels

J.A. Happ, LHP, Blue Jays
The aforementioned dearth of available starting pitching could make the 35-year-old left-hander an appealing option should Toronto make him available. Happ is working on his fourth straight season with a sub-4.00 ERA (he's at 3.48 following five shutout innings against the Rays on Wednesday), striking out more than a batter per inning in the process. Happ isn't a workhorse -- he's only thrown more than 170 innings twice in his career -- though he's on pace to hit 195 this season, which would match his career high.
Potential fits: Dodgers, Cubs

Danny Duffy, LHP, Royals
Duffy has been a popular name when it cones to trade speculation, though with $46 million owed to him over the next three seasons, a team looking to acquire him must believe he's worth the long-term investment. Duffy got off to a terrible start this season (1-6. 6.88 ERA in his first 10 starts), but he's 2-0 with a 2.10 ERA over his past four starts. The southpaw's stock is on the rise, but he may have to pitch a lot better given the financial commitment.
Potential fits: Giants, Brewers