The Braves upended Pool A topnotcher J&T Express, 22-19, while the Tropang Giga sent Purefoods packing behind a thrilling 20-18 win.
The other semifinals pairing will pit Barangay Ginebra and Platinum Karaoke.
New recruit Ralph Cu finished with 11 points to lead the Kings past San Miguel Beer, 19-18.
Platinum Karaoke meanwhile, whipped the Dyip, 17-10.
Jorey Napoles and the Braves get past Marvin Hayes and the Express.