"When it came to the Master System, Sega was dominant in virtually every market except for Japan and the U.S."
I don't think it's true, at least not in a "in virtually every market" kind of way.
In France, it was long though that the Master System and the NES sold roughly the same (and I include myself in the people who thought that). While writing the third book of his history of Nintendo, Florent Gorges was able to access the numbers from GFK. From 1988 to 1993, Nintendo sold 1 788 000 NES while Sega sold 970 000 Master System and Sega didn't won a single year.
In Europe, in Mars 93, Sega had sold 6,2 millions units (I don't know if Sega included Australia as a PAL country in those numbers). At the same time, Nintendo had sold 8,51 millions units in it's "other" region (which include Australia and, I think, others small countries outside Europe).
I have no idea how many NES units from the "other" region where sold outside Europe but it must be more than 2,31 millions to make Sega the dominant brand in Europe. I don't think it happened (it's more than what was sold in France and I don't think a highly populated country outside Europe is included in those numbers) but I don't have data to prove it one way or the other.
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Re: Feature: A Look Back At the SG-1000, Sega's First Ever Home Console
"When it came to the Master System, Sega was dominant in virtually every market except for Japan and the U.S."
I don't think it's true, at least not in a "in virtually every market" kind of way.
In France, it was long though that the Master System and the NES sold roughly the same (and I include myself in the people who thought that). While writing the third book of his history of Nintendo, Florent Gorges was able to access the numbers from GFK. From 1988 to 1993, Nintendo sold 1 788 000 NES while Sega sold 970 000 Master System and Sega didn't won a single year.
In Europe, in Mars 93, Sega had sold 6,2 millions units (I don't know if Sega included Australia as a PAL country in those numbers). At the same time, Nintendo had sold 8,51 millions units in it's "other" region (which include Australia and, I think, others small countries outside Europe).
I have no idea how many NES units from the "other" region where sold outside Europe but it must be more than 2,31 millions to make Sega the dominant brand in Europe. I don't think it happened (it's more than what was sold in France and I don't think a highly populated country outside Europe is included in those numbers) but I don't have data to prove it one way or the other.
The source for the French numbers is, AFAIK, only available in french, but I took a photo :
https://omakebooks.com/fr/l-histoire-de-nintendo/314-lhistoire-de-nintendo-vol3-9782919603435.html
https://imgur.com/a/GdEJfA1
Sources for the sales numbers in Europe :
https://www.neogaf.com/threads/retro-sales-age-thread.981407/
https://www.neogaf.com/threads/nintendo-historical-shipment-data-1983-present.701305/