The grind of the fantasy baseball season is won on the margins. While these MLB players are actually humans, you need to look at them as if they were commodities on the stock market. Value goes up, and value goes down. Too many people are overly concerned with Rest of Season Player Rankings, so you gain an advantage if you narrow the time frame down a bit, whether it’s monthly or weekly. By diving into the last seven days of FanGraphs data and backing it up with Statcast metrics, we can identify which trends are sustainable and which are smoke and mirrors. Whether you are looking to pull off a heist using our Fantasy Baseball Trade Analyzer or scour the fantasy baseball waiver wire, here is who is moving the needle this week.

Fantasy Baseball Stock Risers: Power and Opportunity

Michael Busch, 1B Chicago Cubs – The Power Returns

To open the season, Michael Busch was the poster child for "warning-track power." While the contact was there, the lack of home run production was frustrating for managers expecting a repeat of his 30-homer pace. However, the last seven days have seen a massive shift. His barrel rate is climbing, and he’s finally elevating the ball to the pull side. This recent surge gives us renewed hope that he can reach that 30-HR plateau again. There is still a small buy-low window here before his season-long HR totals catch up to his underlying metrics.

Joe Mack, C Miami Marlins – The New Man in Miami

The Marlins finally pulled the trigger, sending down Augustin Ramirez after his offensive struggles failed to mask his defensive liabilities. Enter Joe Mack. Mack is a polished defensive backstop, which secures his playing time, but his fantasy intrigue lies in his versatile toolset. He brings legitimate power potential, surprising speed for a catcher, and the elite on-base skills he showcased in the minors. Add him now as a high-floor C2 with C1 upside.

Ezequiel Duran, 2B Texas Rangers – Utility with Discipline

With Josh Smith on the IL, Ezequiel Duran has seized the everyday role in Texas. What stands out most over the last week isn't just the counting stats, but his plate discipline; his walk-to-strikeout ratio has improved significantly. Combined with his multi-position eligibility, Duran is a Swiss Army knife for your roster. Even when Smith returns, Duran’s ability to play all over the infield ensures he’ll stay in the lineup.

Riley O’Brien, RP St. Louis Cardinals – A Lockdown Closer

Riley O’Brien has established a firm grip on the ninth inning in St. Louis. After saving three games last week (bringing his season total to 11), his efficiency is staggering. He boasts a 20:1 K:BB ratio, a 2.00 ERA, and a 0.89 WHIP. The Cardinals don't need to be a powerhouse for O'Brien to be elite; his ability to limit baserunners means he’ll be there for every save opportunity they generate.

 

 

 

Fantasy Baseball Stock Fallers: Bench These Bats

Ketel Marte, 2B Arizona Diamondbacks – The Ultimate Buy-Low

It has been a week to forget for Ketel Marte owners, characterized by a 26.1% strikeout rate and almost zero production. However, don't let the box scores fool you. His Statcast data, specifically his Hard-Hit rate and Launch Angle, remains elite. This is actually the perfect time to trade for him. Target a frustrated owner and buy low before his luck turns around. For more on the buy-low opportunity, check out what James Grande had to say about him on the latest episode of Caught Stealing, the Fantasy Alarm, a fantasy baseball podcast.

Matt Chapman, 3B San Francisco Giants – Cold in the Bay

We know the script: Matt Chapman starts cold and ignites in the second half. But with a rising strikeout rate and a lack of power in a ballpark that suppresses fly balls, fantasy managers can't afford to wait. Until he shows he can overcome the "Oracle Park effect," he belongs on your bench. Hold for a mid-summer trade, but don't start him now.

Garrett Mitchell, OF Milwaukee Brewers – Sidelined by Illness

A recent bout with illness sapped Garrett Mitchell’s momentum just as he was locked into the leadoff spot. His plate discipline has cratered, and the strikeouts are mounting. While his defense and speed make him valuable to the Brewers, he needs to maintain a high OBP (currently .364) to keep his job. Stash him on your bench until the health and eye at the plate return.

Andrew Painter, SP Philadelphia Phillies – Command Concerns

The "live arm" is there, but the results are regressing. Andrew Painter’s walk-rate and HR/9 have ticked up over his last two starts, suggesting he’s struggling to harness his premium velocity. Do not drop a talent like Painter, but "park" him on your bench. Wait for a bounce-back start with improved command before trusting him in your active rotation again.