Musetti crushed Kazakhstan's Alexander Shevchenko 6-3, 6-1, and Tabilo eliminated fourth seed Brandon Nakashima 6-4, 7-6(0) in Monday's semi-finals in China.
Musetti won 92% (24 of 26) of the points on his first serve and never faced a break point. Tabilo trailed 6-5 in the second set before levelling the match and sweeping the tiebreaker. He struck 11 aces and likewise never faced a break point.
Hangzhou Open
Third seed Alexander Bublik fired 19 aces and joined elite company by defeating Chinese home favourite Wu Yibing 6-3, 6-3 in the semi-finals.
Bublik became the fourth man to reach finals on all three surfaces this season, joining Carlos Alcaraz, Jannik Sinner and Alexander Zverev. He finished Monday's 61-minute victory with 28 winners and just six unforced errors.
With wins this season on clay (Gstaad, Kitzbuhel) and grass (Halle), Bublik will try to add a hardcourt title against French qualifier Valentin Royer. Royer saved both break points and defeated fourth-seeded countryman Corentin Moutet 6-3, 6-2 to reach his first tour-level final.