Greece booked their spot in the last four with help from the highest ranked player in the competition, Stefanos Diamantis.

The world number 18 beat Anthony Dittmar 6-3, 6-2 to make the score 1-1 in their final group tie against Germany after Steffen Sommerfield won the opening singles rubber 6-0, 6-0 against Greek opponent Goirgios Lazaridis at Vilamoura Tennis Academy.

Despite losing so comfortably to Sommerfield, Lazaridis partnered Diamantis to a 6-2, 6-4 win in the deciding doubles tie to put Greece through.

Greece will face Italy in the last four after they eased past Croatia 3-0 in their own group.

Silviu Culea and Luca Arca won their singles ties 6-2, 6-0 and 6-1, 6-3 respectively, before Luca Spano teamed up with Culea to win the doubles 6-2, 6-3.

The other semi-final will see Slovakia face top seeds Austria after they beat hosts Portugal 3-0.

Austria advanced with a thumping 3-0 victory against Hungary, during which they lost just one game across the three rubbers.

Thomas Flax and Joseph Riegler ran out 6-0 6-1 winners over Attila Farkas and Laszlo Farkas in the doubles.

Martin Legner and Nico Langmann had earlier triumphed 6-0, 6-0 in their respective singles rubbers.

In the women’s event, Russia, Turkey, Denmark and Italy were already guaranteed the semi-final spots before the last two round robin matches took place.

Top seeds Russia secured first place in their group with a 3-0 whitewash win over Denmark.

Russia, winners of the 2016 European Qualification event, will go up against Turkey.

Italy, who beat Turkey 3-0 in their last group tie, will face Denmark for a spot in the final.

If Russia and Italy make it through their respective semi-finals, as is expected, they will set up their third meeting in a European Qualification final since 2014.

The eventual winners in Vilamoura will secure a place at the 2019 World Team Cup Finals in Israel, due to be held from May 13 to 18.