Germany remained unbeaten in the Davis Cup group stage finals after sweeping aside Chile 3-0 on Thursday.
In a Group C match on indoor hard courts here, Maximilian Marterer beat Tomas Barrios Vera 6-1, 6-3 before Yannick Hanfmann defeated Alejandro Tabilo 7-5, 6-4 to clinch the tie.
Kevin Krawietz and Tim Puetz then took apart Barrios Vera and Matias Soto 6-1, 6-3.
Germany, playing without No. 2-ranked Alexander Zverev, beat Slovakia 3-0 on Tuesday in their opening match. Chile lost their first match to the United States.
Less than two weeks after his shocking second-round exit at the US Open, Carlos Alcaraz was staring at another upset when a set down in his opening group-stage match for Spain on Wednesday.
This time, Alcaraz turned things around — though he needed some help from his opponent.
The No. 3-ranked Alcaraz clinched victory for Spain against the Czech Republic in Group B owhen Tomas Machac retired injured with the score at 6-7 (3), 6-1 in Valencia.
It gave Spain an unassailable 2-0 lead, with Roberto Bautista Agut having already defeated Jiri Lehecka 7-6 (1), 6-4, and Alcaraz then partnered with Marcel Granollers-Pujol to win the doubles in three sets and wrap up a 3-0 victory.
Spain joined the United States, defending champion Italy and Britain in gaining victories on Wednesday.
Italy didn't need top-ranked Jannik Sinner, the newly crowned US Open champion, to begin its title defence with a 2-1 win over Brazil in Group A in Bologna.
Matteo Berrettini beat Joao Fonseca 6-1, 7-6 (5) before Matteo Arnaldi gave Italy an unassailable 2-0 lead by beating Thiago Monteiro 7-5, 6-7 (4), 7-6 (5). Rafael Matos and Marcelo Melo won the doubles for Brazil, beating Simone Bolelli and Andrea Vavassori in three sets.
Britain defeated Finland 2-1 in Manchester in Group D.