Slovakia provided the biggest shock of the Davis Cup qualifiers as they knocked out 2023 semi-finalists Serbia.
France, Czech Republic, Belgium, Canada, Germany, the Netherlands, USA, Finland and Brazil also booked their place in September's group stages.
They join last year's winners Italy, 2023 runners-up Australia and wildcards Great Britain and Spain.
A total of 16 nations will contest the Davis Cup group stage across four cities from 10-15 September.
The competition will conclude with the 'Final 8' - quarter-finals, semi-finals and final - in Malaga.
Slovakia dumped out a Serbia side missing 24-time Grand Slam champion Novak Djokovic, winning all four matches on the indoor clay in Kraljevo to reach the group stage of the new format for the first time.