​At the start of the season, the Automated Ball-Strike (ABS) challenge system was officially implemented into MLB games. This uses a full automated system based on Statcast data to challenge certain calls made by umpires. Now that we’re at the All-Star break, we have more than half a season of data to analyze about how teams are using their challenges. Let’s take a look at how the Brewers have been utilizing it.Between offense and defense, the distribution of challenges has been mostly even across MLB. There have been a total of 6,040 challenges using the ABS system so far this season. Here is the breakdown of those challenges.AdvertisementAdvertisementAdvertisement2,810 challenges have been initiated by the batter. 1,345 (48%) of those were overturned.3,230 challenges have been initiated by the defense (catcher or pitcher). 1,872 (58%) of those were overturned.While this has been the average across MLB, variations within teams can be drastic. The Brewers have one of the more skewed use of challenges in their team. They have challenged 215 pitches across their 96 games. Here is their breakdown.Of 66 challenges that have been initiated by the batter, 28 were overturned (42% success rate). That is the fewest number of challenges of any team in MLB. Their success rate ranks 23rd.Of 149 challenges that have been initiated by the defense, 80 were overturned (54% success rate). That is the second-highest number of challenges of any team in MLB. Their success rate ranks 21st.On a team level, the Brewers have not had the most success with challenges. They have chosen to let their catchers do the bulk of challenging, with 68.8% of their challenges made by the catcher. In fact, when it comes to the batters, one player is responsible for a significant number of batter challenges. Let’s talk about that first.First, let’s take a look at the Brewers’ challenges as a team. Here is an overview of their stats.AdvertisementAdvertisementAdvertisementThey have averaged 2.2 additional overturns versus the expected outcome for an average team. However, they have lost 1.9 run value versus the expected value.They have had five strikeouts overturned due to challenges, last in the league. The Orioles lead this stat with 20 strikeouts overturned.They have gained three additional walks from challenges, tied for second to last in the league. The Twins lead this stat with 15 additional walks.Twice this season, a challenge has resulted in a strikeout on a full count being changed into a walk.Their challenge rate on “challengeable” pitches is 2.7%. That is also last in the league, with the Rockies leading at 6.6%. A challengeable pitch for a batter is a called strike when the batting team has challenges remaining. (Exceptions are when a position player pitches, which is not challengeable, and if the ABS system malfunctions.)Of their 66 challenges, 47 are considered “reasonable.” That 71% rate ranks seventh in MLB. Baseball Savant has a breakdown on what is cons