The 19-year-old Shnaider swept the first seven games in the 77-minute quarterfinal and will next face No 3 seed Marie Bouzkova of the Czech Republic, a 6-0, 6-4 winner against Colombia's Camila Osorio.
Czech Katerina Siniakova and Canada's Leylah Fernandez will meet in the other semifinal.
Siniakova advanced with a walkover after Germany's Laura Siegemund was forced to withdraw before the match. Fernandez earned a 6-3, 6-4 win over Aliaksandra Sasnovich of Belarus.
Jasmin Open Monastir
No. 1 seed Jasmine Paolini fought off a challenge from No. 6 seed and fellow Italian Lucia Bronzetti 7-5, 7-6 (3) to move into the semifinals in Monastir, Tunisia.
Awaiting Paolini is fourth-seeded Lesia Tsurenko of Ukraine, who needed just 76 minutes to finish a 6-3, 6-2 victory over Spain's Nuria Parrizas Diaz.
No. 2 seed Elise Mertens of Belgium and No. 8 Clara Burel of France will meet in the other semifinal. Mertens took out Japan's Mai Hontama 6-3, 6-2 and Burel breezed to a 6-3, 6-1 win over Italy's Lucrezia Stefanini in 61 minutes.
Transylvania Open
Fourth-seeded Spaniard Rebeka Masarova outlasted No. 5 Ana Bogdan of Romania 3-6, 7-6 (4), 6-3 in quarterfinal action in Cluj-Napoca, Romania.
Masarova will face another Romanian, unseeded Elena-Gabriela Ruse, in the semifinals. Ruse advanced with a roller-coaster 6-1, 0-6, 6-1 win against Colombia's Emiliana Arango.
Tamara Korpatsch and Eva Lys will square off in an all-German semifinal. Lys crushed Russia's Ekaterina Makarova 6-2, 6-2 in 71 minutes, while Korpatsch had to rally for a 3-6, 6-2, 6-4 over Ukraine's Daria Snigur.
--Field Level Media
