Germany number one Angelique Kerber cancelled out Ana Ivanovic's earlier victory on Saturday to level the Fed Cup World Group Play-off tie at 1-1 between Germany and Serbia with three rubbers still to come.
Former world number one Ana Ivanovic gave last year's finalists a dream start in Stuttgart by seeing off Fed Cup debutant Mona Barthel in three sets for a 7-6 (7/5), 2-6, 6-2 win in the opening match.
The 25-year-old Ivanovic was looking to give Serbia a chance of avoiding relegation to World Group II for the first time since 2011.
However the host Germany team came back as Kerber edged out her lower ranked opponent Bojana Jovanovski in a hard-fought first set and a break at the start of the second set helped her seal a 7-5, 6-2 victory.
Germany is desperate for a return to the World Group having flittered between the top tier and World Group II since enjoying a sustained run at the highest level of the competition between 2000 and 2004.
In Sunday's remaining singles rubbers, Kerber faces Ivanovic while Barthel takes on Jovanovski.
The play-off tie could come down to the final doubles match between Anna-Lena Groenefeld and Sabine Lisicki of Germany against Serbia's Vesna Dolonc and Aleksandra Krunic.