Junior depth is a promise the senior table has to keep. The simplest proxy for whether a country keeps that promise is to count both: how many junior top-100 players, and how many senior top-100 players.
Rankings
Who Actually Converts Juniors Into Seniors?
Junior depth is only useful if it survives the jump to the senior ranking table. A country-level proxy for the conversion.
Senior vs junior top-100 footprint by country
2026-W26
Breakdown
China and Japan lead the combined top-100 footprint; JPN has 30 senior and 20 junior.
Source: ITTF/WTT-style rankings and match dataset. Snapshot 2026-W26.
China and Japan lead on both axes — 25 senior / 24 junior for China, and 30 senior / 20 junior for Japan. The two deepest systems are deep at both levels.
The interesting countries are the mismatched ones. A country with a large junior footprint and a small senior one is either a wave about to age up or a system that fails to convert. A country with the reverse is living off a generation that is not being replaced.
The pipeline table: JPN 20J/30S; CHN 24J/25S; TPE 20J/10S; KOR 13J/15S; FRA 14J/13S; IND 16J/10S; GER 4J/12S; HKG 6J/6S.
Caveat: this is a proxy, not true conversion. True conversion follows the same players over years. This is a same-snapshot, country-level count — enough to build a watchlist, not enough for a verdict. The chart's bubble size reflects the senior count; the junior count is in each label.