Mangaonkar, seeded no. 2, quelled the strong challenge of the Egyptian opponent 11-6 4-11 11-7 5-11 11-9 in 91 minutes in a bitterly contested semi final - the first-ever meeting between the two players - at Juhu Vile-Parle Gymkhana.
Hosny had knocked out the other Indian hope, fourth seed Harinder Pal Sandhu, 3-1 in the quarterfinals yesterday.
Mangaonkar will meet either top seed Zahed Ahmed of Egypt or Malaysian qualifier Sanjay Singh in the final tomorrow.
WSA Tour 2 semi-finals: Chloe Mesic (FRA) bt Birgit Coufal (AUT) 11-4, 4-11, 5-11, 11-9, 11-1; Nouran El Torky (EGY) bt Laura Pomportes (FRA) 11-8, 11-7, 11-8.
