Croatia leads the US 2-0 after day one of the Davis Cup semi-finals while France looks in control over Spain in the second tie on Friday.
Ramos belatedly received public backing from the International Tennis Federation (ITF) and took his place in the chair for Cilic's routine 6-1 6-3 7-6 (7-5) win over Tiafoe.
Ramos gave Williams three code violations in her straight-devices loss to Naomi Osaka final weekend, and the American vast argued she wasn't being treated the equivalent as some male avid gamers.
Coric rallied from two sets to one down to beat Frances Tiafoe 6-7 (0), 6-1, 6-7 (11), 6-1, 6-3 in the fifth and decisive match.
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Gasquet lost to Albert Ramos-Vinolas 1-6, 6-4, 14/12, before Mahut was defeated by Marcel Granollers 6-7 (2), 6-3, 13/11.
The 29-year-old had previously squandered a 6-1 lead in the second set tie-break and hit 72 unforced errors to Querrey's 57.
France will host Croatia in the 2018 Davis Cup final after the French pounded Spain over the weekend and Croatia scraped by the U.S.
Despite losing serve once in the second set, Cilic broke Tiafoe three more times to give himself a commanding lead in the match.
The Croat drew first blood in the seventh game of the opening set and they wasted a set point on the return in the ninth game that proved to be crucial.
"I had bigger victories, but this feeling can not be compared to any other, when the whole nation stands behind you", the 21-year-old Croat added.
Spain was without top-ranked Rafael Nadal, who was ruled out because of the right-knee injury that forced him to retire from his U.S. Open semifinal against Juan Martin del Potro.
Benoit Paire and Lucas Pouille both won their singles matches on Friday to open the 2-0 lead on the hard indoor surface at Stade Pierre Mauroy in Lille, France.