Head-to-Head
Overview
Sam Ryan Ziegann and Noritaka Koizumi have met 1 time so far, all in 2026. Noritaka Koizumi leads 1–0. Their first encounter was at the 2026 M15 Luan (QF), won by Noritaka Koizumi.
By surface
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Sam Ryan Ziegann and Noritaka Koizumi have met 1 time so far, all in 2026. Noritaka Koizumi leads 1–0. Their first encounter was at the 2026 M15 Luan (QF), won by Noritaka Koizumi.