Alexander Zverev led Germany into the semi-finals of the United Cup on January 5 after winning his singles rubber against Greece's Stefanos Tsitsipas before partnering Laura Siegemund in the mixed doubles to clinch the decider.
World number eight Maria Sakkari had given Greece a 1-0 lead with a 6-0 6-3 win over three-time Grand Slam champion Angelique Kerber, before Zverev defeated Tsitsipas 6-4 6-4.
With the team score tied at 1-1, Zverev returned to the court soon after to play the mixed doubles decider, where the Greek pair of Petros Tsitsipas and Sakkari were beaten 6-3 6-3.
