The Origin of the 'Just Hit' Wisdom
First basemen face fewer fielding chances than other infielders, and the throwing distances required of them are short. Aside from relaying outfield throws, they rarely make spectacular plays. This 'invisible defense' quality created the stereotype that first base is the safe haven for power hitters. In NPB, sluggers from Sadaharu Oh to Hiromitsu Ochiai, Kazuhiro Kiyohara, and Nobuhiko Matsunaka have often migrated to first late in their careers. Yet this conventional wisdom rests on a hasty interpretation: that fewer chances means fewer ways to hurt the team. In reality, first base plays decide outcomes more often than the stereotype admits.
Are NPB First Basemen Really Better Hitters?
Contrary to the slugger-at-first image, recent NPB seasons show position-average OPS at first base falling roughly in line with third base and DH, not far above outfielders, especially right fielders. The hitting gap between first basemen and other corner positions has narrowed because teams now have the depth to deploy power bats at their natural positions. The premise that first base is the cathedral of NPB hitting has weakened. The data hint at a paradox: assigning hitters to first did not concentrate offense there, but instead lifted the offensive baseline league-wide.
Fewer Chances, Heavier Each One
A first baseman handles roughly eight to ten chances per game. Most are routine throws, but a few inevitably involve scooping short hops, covering the bag on a tight play, or tracking foul pop-ups along the dugout. The ability to dig low throws prevents infielders from overthrowing in fear of bouncing the ball. A poor defensive first baseman pushes infielders to throw harder, increasing errant throws across the entire infield. UZR may underrate first basemen because the small sample of chances per season produces noisy estimates rather than reliable signal.
Layering NPB's Iconic First Basemen Through Data
Sadaharu Oh's 868 career home runs remain the all-time first base record, and his defensive range and putout totals are also elite. Hiromitsu Ochiai won three triple crowns but received uneven defensive marks at first across his journey through Lotte, Chunichi, Yomiuri, and Nippon-Ham. Takeya Nakamura's offensive numbers rank among the league's best, but his DRS at first fluctuates between positive and negative year by year. By contrast, Kazuma Okamoto and Munetaka Murakami (during dual-duty stretches) post both positive offensive and defensive metrics, a rarity. Ranking first basemen by WAR rather than OPS produces a meaningfully different leaderboard.
Converted First Basemen vs. Native First Basemen
NPB first basemen split into two camps. Converted players move from other positions to make room for their bats, while native first basemen learn the position from their first day in pro ball. Converted first basemen typically struggle with infield coordination: timing the cover at first, holding runners, executing 3-6-3 double plays. Native first basemen master those mechanics and often match converted hitters in WAR despite weaker offensive numbers. A franchise's choice between developing native first basemen or converting outfielders late in their careers shifts winning percentage measurably across a five-year window.
The Future of First Base in a DH-Expanding Era
MLB extended the DH to the National League in 2022, channeling pure hitters worldwide into the DH slot. If NPB's Central League adopts the DH, the first base role will be redefined. Bat-only players will move to DH, while first base will be reserved for defenders. This restructures the value of the position. Defensive ability at first will receive renewed weight, and draft strategy will shift toward acquiring fielders rather than parking power bats at first. The 'just hit' wisdom is becoming a relic. The data argue what should have been obvious: first base must be evaluated on combined offense and defense, just like every other position.