The women's doubles pair of Woon Khe Wei and Vivian Hoo advanced to the semi-finals of the German Open on Friday after upsetting fourth seeds Lee So-hee-Shin Seung-chan.
The eighth-seeded Commonwealth champions won 21-16, 21-7 in just 32 minutes to get their revenge over the South Korean pair for the loss they suffered at the Swiss Open Grand Prix Gold tournament in March 2014.
Malaysian national doubles coach Rosman Razak was pleased with his players' victory over the highly-regarded Korean ladies.
"They got their acts and tactics right from the beginning and never turned back after that. It was a superb performances from them," Rosman said after the match.
The Malaysian duo will take on unseeded Della Destiara Haris-Rosyita Eka Putri Sari for a place in the final after the Indonesian pair beat Thaland's Jongkonphan Kittiharakul and Rawinda Prajongjai.
Unheralded Russian pair Vladimir Ivanov and Ivan Sozonov caused another upset when they shocked Taiwan's top seeded pair Lee Sheng Mu and Tsai Chia Hsin 24-26, 21-15 21-18 in arguably the match of the week so far.
Men's singles top seed Jan O Jorgenson eased to the quarter-finals with a 21-16 21-13 win over Japan's Sho Sasaki, while reigning women's champion Carolina Marin beat Minatsu Mitani 21-6 21-19.
In the semi-finals, Jorgenson will take on Hong Kong's Vincent Wong Wong Ki, while Marin will face Sayaka Takahashi from Japan.