ISO- Isolated Power
ISO measures the raw power of a hitter by taking only extra-base hits — and the type of extra-base hit — into account.
For example, a player who goes 1-for-5 with a double has an ISO of .200.
Extra bases / At-bats OR Slugging percentage – Batting average
Why it’s useful
ISO is fantastic for evaluating the raw power within a player, which, of course, is valuable because extra-base hits tend to have a big impact on who wins games. Batting average tells you how often a player records hits, but not how often his hits go for extra bases.
The home run and ISO leader boards correlate strongly. If a player produces a high ISO, he is likelier to contribute in the homer and extra-base hit departments. ISO takes away singles. Extra base hits are King in DFS.
If you poll veteran fantasy/DFS baseball experts 8 out of 10 will tell you that ISO is the stat that matters most when selecting batters. It is the most valuable and correlated with fantasy points.
Let’s take a look at the TOP 20 IS0 for 2019 and see if our usual DFS stars are on the list :
They are all there. The top 5 is a Who’s Who of DFS baseball. Yelich. Gallo. Joc. Bellinger. Bell.
Let’s look at the bottom of the list. There may be some surprises. This gives you an idea of who Not to play or to use as a tiebreaker when deciding who to play over a couple of players.
Miggy Cabrera. Jose Ramirez. Joey Votto. All entrenched as the worst ISO in MLB. Some eye openers on the list.
One last list. Let’s take a look at the Top 20 ISO for the last 30 days. This gives us an idea as to who is swinging the bat the best right now in MLB.
So that’s ISO. Another tool for your DFS toolbox.