With the first game of the ALCS less than an hour away, let's take a quick look at the pitch frequency for a player that has been so instrumental in the New York Yankees postseason success: Mariano Rivera.
As the heatmap below shows, Mariano Rivera has an amazing ability to command the strike zone.
Notice how Rivera barely touches the middle of the plate.
Here are Rivera's Righty-Lefty heatmaps vs. the rest of the league:
As you can see from the top map, Rivera lives on the inside corner to lefty batters. In fact, the majority of his pitches fall outside the designated strikezone. Meanwhile, the rest of the league favors throwing down and away to LHB.
Against RHB, Mo spreads out his pitches a bit more. However, notice how he barely ever throws to the middle inside part of the plate to righties. He also busts righties up and in, again in contrast to the rest of the league.
As a matter of comparison, here are the pitch frequency heatmaps for 3 other AL closers:
All three of the above closers tend to pitch to the middle of the plate, a striking contrast to Rivera's pitch frequency.
Lastly, here's a look at Rivera's pitch frequency since 2008: