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, Austria and Spain in the Final 8.
The Associated Press and PA contributed to this report.