Aleksandrs Samoilovs and Jānis Šmēdiņš of Latvia remained on course for victory at the International Volleyball Federation Beach World Tour in Jūrmala.
The home favourites eased to a 21-15, 21-13 win against French pair Quincy Aye and Arnaud Gauthier-Rat to book their semi-final spot.
They will face Germans Armin Dollinger and Eric Stadie tomorrow as they bid for glory at Majori Beach in the Latvian city.
Dollinger and Stadie won the all-German last-eight battle with Jonathan Erdmann and Sven Winter 21-19, 21-18.
Estonia's Kusti Nõlvak and Mart Tiisaar reached the semi-finals after fighting back to defeat Americans Stafford Slick and William Allen.
Slick and Allen won the opening set before succumbing to the Estonian 12th seeds 21-16, 16-21, 8-15.
They had earlier dispatched Latvian top seeds Mārtiņš Pļaviņš and Edgars Točs.
They will face Aliaksandr Dziadkou and Pavel Piatrushka of Belarus in the last four.
Casey Patterson and Chase Budinger of the United States edged a close first set before the Belarusians battled through to win 19-21, 21-16, 15-13.