Tottenham have had to come to terms with the disappointment of being knocked out of the Champions League by Juventus last week.
And it wasn't long until it was three.
And Carlos Carvalhal claimed there was a noticeable difference between the two teams.
Swansea essentially began where they left off in their last game, which saw them forced to batten down the hatches and defend for 79 minutes for a 0-0 draw after Jordan Ayew was sent off against Huddersfield.
"We are happy with our run in the cup but after this, we focus on our main competition and that is the Premier League". Striking through the crown and into the bottom corner via a touch from Lukasz Fabianski. Youngster Connor Roberts is once again expected to get the nod at right-back.
Saturday's game was a relative stroll in the park.
That was all the more impressive in the absence of their talisman Harry Kane, who is ruled out until April with an ankle injury.
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With Eriksen and Son, as well as Lamela and Dele Alli, Spurs supporters know their side will not be short of players who can create openings, Kane or not. Time is on his side but this was an opportunity missed.
Abraham, who scored 23 goals for Bristol City in the Championship last season, started this campaign in decent fashion, scoring five goals that would earn him a call-up to the senior England side for friendlies against Germany and Brazil.
And Pochettino was pleased with this side's display but he didn't want to talk about another VAR incident.
But with Mousa Dembele rested, the winger was Pochettino's go-to guy in the win and he didn't disappoint. He will provide them with dynamism and directness from outwide.
And Eriksen added a third after the break to put the tie beyond doubt. The Spaniard will need to be ruthless against the Welsh outfit, if Spurs are to go through to the last four.
But, on this evidence, Spurs have a real shot at winning the first trophy of Pochettino's four-year reign and their first since the 2008 League Cup. "But it's an FA Cup so it won't only be our fans in the stadium, so it will be fun to play". Tottenham reached the semifinal a year ago before losing 4-2 to Chelsea.
Having signed for the Lilywhites in the January transfer window from Paris Saint-Germain amid much anticipation, the Brazilian speedster is yet to make a serious impact for his new club.