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Early June Isolated Power (ISO) for fantasy baseball: the top 100

Using ISO is a good way to find out which hitters are hitting for power.

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Winslow Townson-USA TODAY Sports

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Isolated power (ISO) is a measure of a hitter's extra base hits per at bat. It is calculated by subtracting batting average from slugging percentage. For example, Manny Machado has a .593 slugging percentage and .308 batting average, which gives him a .285 ISO.

According to research done over at Baseball Prospectus, ISO stabilizes around 160 at bats. Now into June, most hitters have crossed that threshold. Here are the top 100 batters in ISO and their differentials from last season. MLB average ISO is .157 in 2016.




David Ortiz



Adam Duvall



Yoenis Cespedes



Jay Bruce



Nolan Arenado



Mark Trumbo



Trevor Story



Manny Machado



Todd Frazier



Robinson Cano



Mike Napoli



Anthony Rizzo



Bryce Harper



Chris Carter



Evan Longoria



Matt Carpenter



Jackie Bradley, Jr



Carlos Beltran



Jake Lamb



Khris Davis



Mookie Betts



Josh Donaldson



Giancarlo Stanton



Carlos Gonzalez



Gregory Polanco



Byung Ho Park



Corey Seager



Jose Bautista



Marcell Ozuna



J.D. Martinez



Daniel Murphy



Mike Trout



Nelson Cruz



Kris Bryant



Miguel Cabrera



Michael Saunders



Corey Dickerson



Nick Castellanos



Kyle Seager



Matt Kemp



Neil Walker



Zack Cozart



Miguel Sano



Justin Bour



Jonathan Lucroy



Edwin Encarnacion



George Springer



Aledmys Diaz



Michael Conforto



Salvador Perez



Ryan Braun



Chris Davis



Eugenio Suarez



Joc Pederson



Jose Altuve



Matt Holliday



Dexter Fowler



Marcus Semien



Eric Hosmer



Ian Kinsler



Steven Souza Jr



Curtis Granderson



Travis Shaw



Carlos Santana



Adrian Beltre



Ryan Zimmerman



Victor Martinez



Paul Goldschmidt



Joey Votto



Brandon Belt



Wil Myers



Charlie Blackmon



Albert Pujols



Buster Posey



Jayson Werth



Brandon Drury



Maikel Franco



Randal Grichuk



Brad Miller



Hunter Pence



Andrew McCutchen



Nomar Mazara



Jonathan Schoop



Christian Yelich



Yasmany Tomas



Eduardo Nunez



Rougned Odor



Troy Tulowitzki



Stephen Piscotty



Carlos Correa



Ben Zobrist



Freddie Freeman



Ian Desmond



Dustin Pedroia



Logan Morrison



Coco Crisp



Colby Rasmus



Brandon Crawford



Luis Valbeuna



Starling Marte



David Ortiz is having the greatest offensive age 40+ season ever. His wRC+ sits at 200 as of this afternoon, 63% higher than Willie Mays' 157 wRC+ in 1971, the next closest to Ortiz. To keep this pace up would be well beyond anything Ortiz has ever put up in a season. His best wRC+ was 175, in 2007. Ortiz will almost certainly regress going forward, but will likely still end up among the best in the game by seasons end.

This is now Yoenis Cespedes' 5th year playing baseball in the big leagues. He's been a completely different hitter since coming to the Mets in August of last year. His ISO is about 70 points higher than last year's .251, which was seen as a career year type of performance. It's possible Cespedes is just timing up MLB pitching better in his 5th season, and we can reasonably expect a significantly elevated level of performance from him going forward.

Jay Bruce appears to be over some injury problems the last few years and is having the best offensive season of his career. His start to 2016 is comparable to his 2012 season, where he finished with a .281 BA and 25 HR.

Robinson Cano has had a monstrous bounce back year for power after playing most of the first half of 2015 with a stomach illness that apparently zapped his power. Adjusting for run scoring environment, Cano is having a season similar to his peak 2012 season with the Yankees. This doesn't mean the same for fantasy purposes, because Yankee Stadium is a much more hitter friendly environment than SafeCo, but it does show that Cano's skills are not eroding like we may have feared last year.

Bryce Harper being ranked #13 in ISO yet having his ISO differential be -.47 says more about how great his 2015 season was than anything else. Harper is seeing less first pitch strikes than ever before and likely isn't getting a whole lot of good pitches to hit.

Evan Longoria's power output looks a lot like his vintage years, with ISOs over .230 routinely. His home run to fly ball rate (15.4%) is about what it was in 2013, too, the last of his peak seasons.

I traded Mookie Betts last year at the trade deadline in my keeper league in a win now move for Chris Archer and David Ortiz. I could only keep Ortiz based on my league rules. I don't regret it, because the move helped me win a title, and flags fly forever. I also traded him around the time he had his concussion, and I never saw this type of power output coming from him. Betts already has 14 HR, just 4 less than his 2015 total. He's one of the best young players in baseball.

Giancarlo Stanton is a mess, and I'm not sure what is going on. He is striking out 34% of the time, which is scary high. I wonder if this is at all related to some sort of delayed effect from getting hit in the face in 2014, but that is just reckless speculation without much substance. He is just 26 years old, it is strange to see a Hall of Fame type talent fall apart like this.

Daniel Murphy is a fundamentally different hitter after making mechanical adjustments in the second half of last season with the Mets. He is no longer a mediocre hitter. He is legitimately a top hitter in the game right now. Murphy has a .492 BA on ground balls, which will come down as the season goes along, but he's striking the ball well on grounders based on launch angle + exit velocity measurements, so he appears to be able to sustain a well above average BA on ground balls.

Jonathan Lucroy has had a huge bounce back year after struggling with a concussion last year. 2015 can probably safely be chalked up to a fluke year because of the brain injury. He has resumed his place as one of the top fantasy catchers.

Jose Altuve is hitting for way more power while keeping his stolen base skills and high batting average. He is now walking at a 10% rate and is seeing significantly less first pitch strikes. He is a legitimate top 5 player.