Mets Infield Defense Will Not Negatively Affect Marcus Stroman

Aside from the prospect cost, one of the areas in which people have evaluated the wisdom of the Marcus Stroman trade has been the Mets infield defense. It was an issue brought up by Buster Olney of ESPN, former Mets executive and SNY contributor Adam Fisher, and others. Certainly, with Stroman having a career 59.4 ground ball percentage, it is a very important consideration.

Before looking at the Mets, we should first analyze the Blue Jays defense. After all, this is the defense Stroman has pitched in front of during this season.

In total, the Blue Jays as a team have a -6 DRS which ranks them as 19th in the Major Leagues. As a team, they have a .310 BABIP, which is the sixth worst in the majors. When you look deeper into those numbers, the Blue Jays do not have a very good infield defense:

  • First Base -4 DRS (24th)
  • Second Base -9 DRS (27th)
  • Third Base 1 DRS (16th)
  • Shortstop 0 DRS (15th)

In total, this is a -12 DRS infield defense. Seeing the Blue Jays right side of the infield defense, you can see why left-handed batters are hitting .272 off of him with a .310 BABIP this year. Another factor to contemplate here is the opponent’s OPS against Stroman is 105 points higher on the turf of the Rogers Centre than anywhere else.

Now, it is fair to say the Mets infield defense has not been good. In fact, earlier this year, Mark Simon of The Athletic noted the Mets were one of the worst infield shifting teams in the majors being one of the few teams who have cost themselves runs by shifting. The Mets team defense is a -61 DRS which stands as the worst in the National League, and it has helped contribute to a .307 BABIP against Mets pitchers.

That .307 BABIP is only slightly better than the one the Blue Jays have yielded. That gives an indication as to how there is not much separation between the two clubs defensively. On that front consider the Mets regular infield defense:

Even with Alonso and Cano being negative DRS defenders, their combined -5 DRS is significantly better than the Blue Jays -13 DRS on the right side of the infield. That should help Stroman against left-handed batters. That’s important in a division with Freddie Freeman, Ozzie Albies, Juan Soto, and Bryce Harper.

On the left side of the infield, Frazier has performed better than the Blue Jays third baseman. That gives the Mets three better defenders than what the Blue Jays typically put behind Stroman. Then there is the issue of Rosario.

At a -15 DRS this year and a -31 DRS over the past two years, Rosario has been the second worst defensive shortstop in the majors. Looking at this, it would appear this is a significant downgrade from the Blue Jays 0 DRS this season. This is damaging when you consider it is at what is considered to be the most important position on the infield.

Lost in that is how Rosario has been a much better defender of late. While it is not the best barometer of defense, it should be noted that while Rosario has 13 errors this year, third worst in the majors, he has only made one error over the past month, and that was on a ball Alonso should have had at first. Looking past that, Rosario has made just two errors since May 8.

Looking at a advanced metrics perspective, Rosario entered the All-Star Break with a Major League worst -16 DRS. That means in the 15 second half games, he has played to a positive 1 DRS. That is similar to what we saw from him when he was called up in 2017 when he had a 1 DRS over 302.0 innings.

If Rosario has figured things out, he is at or better than the 0 DRS Blue Jays shortstops have this year. With Rosario being just 23 years old, his improving defensively is a possibility no one should discount.

With Rosario playing significantly better at shortstop, the Mets defense is actually significantly better than the Blue Jays defense this year. That is an important note to consider when you see Stroman is 6-11 with a 2.96 ERA, 1.227 WHIP, and a 153 ERA+. Overall, it would seem as if Stroman coming to the Mets is actually more beneficial than pitching on the Rogers Centre turn in front of what might’ve actually been an inferior infield defense.

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