In Tokyo, the 21-year-old defeated American world number 79 Giron 6-7 (2/7), 7-6 (7/5), 6-4 to set up a meeting with either Russia’s Aslan Karatsev or Japanese wild card Shintaro Mochizuki.
After defeating qualifier Marcos Giron in the semi-finals, rising American talent Ben Shelton battled back to reach his first ATP Tour final at the Japan Open on Saturday.
Shelton made an appearance in his second career semi-final after making it to the same round at the US Open the previous month.
He gave up a winning opportunity to lose the first set, then fought back to level the match at two breaks down in the second.
Shelton then capitalised on the momentum to win the third set. He finished the match with an ace and celebrated by roaring and thudding his chest.
Shelton, rated 19th in the world, is the only player still in the competition following a week of upsets.
In the second round, Taylor Fritz, the top-seeded American, was defeated by world number 215 Mochizuki.
Both Casper Ruud of Norway and Alexander Zverev of Germany withdrew from the competition early.