Castillo’s zBall% (the percentage of pitches, caught within the strike zone, called a ball) was 16.8%, tying him for the worst rate among all catchers with a sample size over 7900;
his oStr% of 6.0% (the percentage of pitches, caught outside the strike zone, called a strike) ranked dead last in MLB for catchers having as many opportunities as he had. Put simply, Castillo was great at making strikes look like balls, and inept at making balls look like strikes.
Sample Size Greater Than 7000 RAA zBall% oStr% +Calls Sample
Miguel Montero 24 11.00% 9.30% 180 9535
Mike Zunino 22.3 10.50% 9.20% 168 8983
Jonathan Lucroy 22.1 11.50% 9.20% 166 10064
Buster Posey 17.7 10.20% 8.90% 133 7360
Russell Martin 11.7 11.80% 8.70% 88 7523
Brian McCann 11.4 10.40% 7.90% 86 7698
Travis d'Arnaud 10.3 11.90% 8.40% 77 7795
Jason Castro 9 11.70% 8.00% 68 8655
Yan Gomes 8 11.00% 7.60% 60 9130
Yadier Molina 2.2 11.90% 7.50% 17 7380
Chris Iannetta -5.3 14.00% 7.20% -40 7616
Tyler Flowers -5.6 12.70% 6.90% -42 9682
Alex Avila -7 13.80% 7.20% -52 8971
Robinson Chirinos -7.9 14.20% 6.80% -60 7068
Devin Mesoraco -8.1 12.80% 6.30% -61 7772
Carlos Ruiz -10.3 15.60% 7.30% -77 8290
Salvador Perez -10.6 13.40% 6.60% -80 10730
Wilin Rosario -11.8 14.40% 6.50% -88 7261
Kurt Suzuki -19.8 15.70% 6.10% -149 8106
Dioner Navarro -20 16.80% 6.60% -150 8003
Welington Castillo -24.3 16.80% 6.00% -183 7903
Jarrod Saltalamacchia -24.4 17.30% 6.10% -183 7627
Showing their commitment to upgrading their pieces behind the plate, the Cubs announced the signing of David Ross this past Friday. He's another fantastic pitch framer, and someone the pitching staff can trust. In a sample size of only 3691, Ross was able to produce an RAA of 10.5, which was good for 13th in all of MLB. With this tandem of catchers, the Cubs have arguably the most elite combination of pitch framers heading into next season.