The 22-year-old remained perfect against Musetti and reached his fourth ATP final .

The American will face Olga Danilovic for the title at the Guangzhou Open.

Ben Shelton saved four set points in the second set tiebreaker subduing Arthur Fils 6-3, 7-6(9) to battle into his third career final at the Swiss Indoors Basel.

Olympic gold-medal champion Zheng Qinwen defeated Diana Shnaider 7-6(5), 6-3 to reach her second straight final at the Toray Pan Pacific Open.

Musetti rallied for a takedown of top-seeded Zverev to reach the semis in Vienna .

Ben Shelton saved all six break points he faced squeezing out a 7-5, 6-7(3), 6-4 win over top-seeded Andrey Rublev to reach his seventh career semifinal in Basel.