He has made great strides in his batting this season, even reaching second place in the batting average rankings at one point.

Hokkaido Nippon-Ham Fighters' Tatsuki Mizuno currently boasts a batting average of .292, ranking fifth in the league. Despite short stop, a position with significant defense demands, he has maintained a high level of batting performance, even reaching second place in the batting average rankings at one point, giving his team a significant advantage in their battle for the top spot.

This article will introduce fielder’s choice 's characteristics as hitter, based on his past performance and metrics. We will examine the strengths and characteristics of this promising short stop who is showing signs of a batting breakthrough, and also consider the reasons for his good performance this season. (*Records are as of the end of the game on July 16th)

IsoD showed improvement in 2025, but...

The following are the year-by-year statistics that fielder’s choice has recorded since turning professional.

In his first year as a professional in 2022 and the following year, 2023, his batting average remained in the .100s for two consecutive years, and his OPS was also low, at .334 in 2022 and .481 in 2023, indicating he struggled in terms of metrics as well. His playing opportunities were limited, with only 21 games in 2022 and 31 in 2023, but his batting average improved year by year, reaching .220 in 2024 and .247 in 2025. Consequently, his number of games played also exceeded 100 for two consecutive years starting in 2024.

Not only has his batting average improved each season, but his on-base percentage and slugging percentage have also continued to rise, and his OPS has been increasing for five consecutive seasons from his rookie year to the present. He currently leads the league with six triple, and his OPS of .788 this season ranks him 7th in the league, making him a noteworthy example of hitter has grown into one of the most productive hitters in the league.

Looking at various metrics, his career batting average is .242, while his career on-base percentage is .290, falling short of 30%. His IsoD (Isolated Base Draw), which shows the difference between batting average and on-base percentage, is also somewhat low at a career average of .048. These numbers suggest that he has a batting style that involves aggressively taking on batters rather than patiently watching the ball.

In particular, in 2024, the year he played in over 100 games for the first time in the first team, he drew 13 Walk in 359 plate appearances, and his IsoD was .031, clearly demonstrating the aforementioned trend. Amidst this, in 2025, his on-base percentage rose to .317, exceeding 30% for the first time in his career, and his IsoD also improved to an average level of .070, indicating an increase in the rate at which he drew Walk compared to before.

However, in 2026, he returned to an aggressive batting style, with a batting average of .292, an on-base percentage of .336, and an IsoD of .044. The fact that he has steadily improved his batting performance while returning to his previous batting style shows the results of fielder’s choice trial and error and his strong desire for improvement.

Furthermore, the "BB/K" metric, which measures a player's plate discipline and ability to manage strike zone by dividing Walk by struck out, was low at around 10% for three consecutive years from 2022 to 2024. However, in 2025 and 2026, he recorded a figure of .304 for two consecutive years, showing an improving trend compared to the early stages of his career.

Despite an improvement in IsoD in 2025 and a return to a more aggressive hitting style in 2026, Mizuno's BB/K numbers remained at the same level in both seasons. This fact could be seen as an indication of fielder’s choice 's improved ability to manage strike zone.

Does being proactive lead to improved academic performance?

From here, we will look at an indicator called "BABIP," which shows the percentage of batted balls that become hit, excluding Home Run runs. BABIP is considered an indicator that is heavily influenced by luck, and the general benchmark value is said to be .300.

fielder’s choice 's BABIP was .200 in 2022, .250 in 2023, and .269 in 2024, all significantly below the standard in the first three seasons of his career. These numbers offer some insight into why fielder’s choice struggled offensively during those periods.

In 2025, his BABIP improved to .299, close to the benchmark, and his batting average also improved accordingly. This season, his BABIP has dramatically increased to .337, well above the benchmark, which could be seen as a rebound after being unlucky throughout his career.

Since BABIP represents the probability that a batted ball hit into fair field will result in hit, it is a very significant number for fielder’s choice has an aggressive batting style and goes after every ball. That's why it's no surprise that fielder’s choice is performing at his best this season more than ever before.

Can he continue to be a major asset offensively as short stop and lead the team in the future?

After showing improvements in both batting average and IsoD last season, fielder’s choice has returned to his approach of only swinging at good pitches, significantly improving his OPS and slugging percentage this season. The rise in BABIP is creating a synergistic effect with his batting style, so it can be said that he is making full use of his strengths.

Can fielder’s choice continue to achieve good results and make a significant offensive contribution to the team as the starting short stop? fielder’s choice 's performance, as he develops into a key player for The Fighters, who are competing for the top spot, will likely be one of the factors that determine the team's success or failure in the second half of the season.