What is their bridge? They are 47 for 72 in save opps but have 97 holds. So their Holds+Save per opportunity is 85.2%. That's really, really good. That means that 85.2% of the time the Brewers brought in a reliever in a hold or save situation, that reliever finished their night with the lead intact.
The Red Sox have 32 saves in 61 save opportunities. They have 84 holds. Their holds+ save per opportunity is 80% flat.
The Yanks have 105 holds and 50 saves in 77 save opps. The Yanks hold +save per opportunity is 90.6%.
The Dodgers, who have the best ERA in baseball but have been having difficulty with their pen have a 78% hold or save per opportunity.
The Guardians have the best relief ERA in baseball and they are at 88%. The Astros are at 87%. The Rays are at 84%. The Cards at 89%. The A's are at 83%. The moral of the story is that the Brewers have a good pen. And while it isn't entirely above everyone else, it has likely contributed to a few more wins. Now, it doesn't take much above .500 to be in the WC race in the NL, so the attrition in the NL also helps them..
I have been saying it for years. Great closers and relievers will consistency allow you to over perform your pythag. One of the best examples was the 2001 Yankees. We overperformed our pythag by 6 games and had an 89% save+hold per opp percentage. The only year during our halcyon days was 97 where we underperformed our pythag and they didn't count holds back then. But it stands to reason, if your best relievers lock down the times they are given leads, you will preserve more leads and win games you should win. If you win the games you should win then pull out the standard amount of games you shouldn't win, you'll end up pretty good