Italy fell behind 1-0 in their quarter-finals, when Francisco Cerúndolo defeated Lorenzo Musetti 6-4 6-1 in Malaga, before Sinner made a mockery of his suboptimal preparation for the contest.
Sinner, whose season already includes two grand slam trophies — at the Australian Open and US Open — plus the title at the ATP Finals last weekend in Turin, Italy, overwhelmed Sebastián Báez 6-2 6-1.
Sinner then teamed with 2021 Wimbledon runner-up Matteo Berrettini in the deciding doubles match to win 6-4 7-5 against Andres Molteni and Maximo Gonzalez.
"He carried me today," Sinner said about Berrettini.
"I'm here trying to do the best I can in the singles.
"If they put me on the court in doubles, I'll also try my best."
The moment — Davis Cup (@DavisCup) @federtennis progressed to the semi-finals! 🤩#DavisCup pic.twitter.com/lXde5fpFXRNovember 21, 2024
After arriving late to Malaga from Turin, Sinner did not get a chance to practice on the Davis Cup competition court before taking on Báez and stretching his streak to 22 sets won in a row.
"In three minutes, he was perfectly comfortable on court," Italy captain Filippo Volandri said.
"He's a special one."
Volandri swapped out his original doubles team, Simone Bolelli and Andrea Vavassori, for Sinner and Berrettini, and the change paid dividends.
On Saturday at 11pm AEDT, Italy will face Australia in a rematch of last year's final, but this time it will only be for a chance to play for the championship.Â
Australia eliminated the United States 2-1 to reach the semi-finals for the third consecutive year.
The other semi, to be contested Friday, is the Netherlands against Germany. The Dutch got past Rafael Nadal and Spain in the quarterfinals earlier in the week, sending the 22-time Grand Slam champion into retirement.
