The American, who entered the competition as a qualifier, becomes the youngest player to reach a WTA final since 2013.
Anisimova had dropped only four games total in her first two rounds of the main draw, and while Schmiedlova put up slightly sterner resistance, the quarterfinal encounter still firmly went the American's way after only 66 minutes of play.More news: Asia Argento Threatens Civil Suit Against Former #MeToo Comrade Rose McGowan
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The second seed had too much experience on the big points as she dashed her teenage opponent's hopes of claiming a maiden WTA title in Hiroshima.
Watson took two breaks - losing her own serve once - to take a one-set lead, before needing just one break in the second to clinch the match 6-3 6-4.