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Why does Atlanta have so many left-handers in their bullpen?

Is it a deliberate decision to stock up on lefty arms, or is it mere coincidence?

The Atlanta Braves have been one of the most active teams this winter, signing three relievers to long-term contracts and making multiple trades. 

One of the major objectives Braves president of baseball operations Alex Anthopoulos appeared to have was revamping his bullpen, seemingly with a focus on velocity. 

In 2023, the hardest pitch thrown by a Braves arm was a 100.7 mph fastball thrown by Spencer Strider to Nick Castellanos in game four of the NLDS. 

Strider owned the highest average four-seam velocity amongst full-time regulars on the team at 97.2 (good for 20th amongst all pitchers in MLB).

But only three Braves pitchers averaged over 96 mph on their fastballs, and the other two weren't full-time members of the roster in 2023 - call-up Daysbel Hernández averaged 96.0 mph in his 45 fastballs thrown and midseason acquisition Taylor Hearn averaged 96.3 mph on his fastball, but threw only 21 pitches for Atlanta at the major league level. 

Most of the Braves free agent signings - returners Joe Jimenez (95.3) & Pierce Johnson (95.8), along with newcomer Reynaldo López (98.0) - are all close or over to that 96 mph mark, all exceeding 95 on their fastballs. 

And of the trade acquisitions, former White Sox lefty Aaron Bummer is close to 95 mph, at 94.7, while former Padres lefty Ray Kerr averaged 96 mph last season. 

(Meanwhile, many of the pitchers that have departed, either via trades or in free agency, come in below that 95 mph mark: starter Kolby Allard (90.5), reliever Collin McHugh (91.3), started Jared Shuster (91.4), reliever Brad Hand (92.4), starter Yonny Chirinos (93.1), starter Michael Soroka (93.2), and reliever Kirby Yates (93.6) all missed it by somewhere between two and four mph.)

But a quick glance at a depth chart will reveal one other thing interesting about this Braves bullpen, as currently constructed: there's a lot of left-handers in there. 

Atlanta projects, per Fangraphs, to have four of their eight bullpen regulars be lefthanders, with another two on either the injured list (Angel Perdomo) or the minors (Ray Kerr). The grouping of AJ Minter, Tyler Matzek, Aaron Bummer, and Dylan Lee project to give Atlanta plenty of options from the left side.  

Why all the lefties? 

Oct 11, 2023; Philadelphia, Pennsylvania, USA; Philadelphia Phillies first baseman Bryce Harper (3) celebrates after hitting a three run home run during the third inning against the Atlanta Braves in game three of the NLDS for the 2023 MLB playoffs at Citizens Bank Park.
Apr 17, 2023; San Diego, California, USA; Atlanta Braves relief pitcher A.J. Minter (33) throws a pitch against the San Diego Padres during the ninth inning at Petco Park. Mandatory Credit: Orlando Ramirez-USA TODAY Sports
Tyler Matzek - Oct 16 - 1

So, is it intentional or just a coincidence? 

It's hard to argue that it's anything but intentional at this point. Alex Anthopoulos made a point at the Winter Meetings to clarify that they didn't target just any lefty reliever, they targeted Aaron Bummer specifically. That tells me that not only did Atlanta want more left-handed options out of their bullpen, they wanted something that he specifically had (with that something specific being a 99th percentile barrel rate allowed of only 2.7%, thanks to an elite 60.1% groundball rate). 

But the extra depth for multiple seasons going forward is certainly nice to have. 

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