Great Britain's Cameron Norrie dug out victory in his Davis Cup singles match to set up a deciding doubles rubber against the Czech Republic which could seal his team's quarter-final place.
Norrie's 6-1 2-6 6-1 victory over Jiri Lehecka means a win for Joe Salisbury and Neal Skupski will put Britain through as group winners.
Salisbury and Skupski play Jiri Vesely and Zdenek Kolar later on Sunday.
Norrie levelled the Group C tie after Dan Evans lost the opening match.
After beating France 2-1 in the best-of-three format on Saturday, Britain know any sort of victory against the Czechs in Innsbruck would guarantee their progress.