Alexander Zverev sent Germany through to the Davis Cup Final 8, outclassing Dino Prizmic on Sunday to secure a 3-1 victory over Croatia.
Zverev took just 77 minutes to ease to a 6-2, 6-4 victory over Prizmic, who was ranked more than 100 places below the US and French Open champion.
Just like in Saturday's victory over Matej Dodig, the second-ranked Zverev dominated on the indoor hardcourt in Halle, Germany, with Prizmic having no break-point chances.
Earlier Sunday, Kevin Krawietz and Tim Puetz overcame Nikola Mektic and Mate Pavic 7-5, 6-2 to hand Zverev the opportunity to send Germany to the Final 8 in Bologna, Italy, in November.
Britain also advanced on Sunday, with doubles pair Henry Patten and Neal Skupski beating Gonzalo Escobar and Diego Hidalgo 6-3, 6-4 to secure a 3-0 win over Ecuador. It is the first time Britain has reached the quarterfinals since 2023.
Germany and Britain will lock three-time defending champion Italy, Canada, Czechia, South Korea and Austria in the Final 8. Chile and Spain were playing for the last remaining spot Sunday.
The Associated Press and PA contributed to this report.