Russia's Andrey Rublev admitted he had to raise his game to reach the semi-finals of the ATP grass court tournament in Halle by beating 2011 champions Philipp Kohlschreiber on Friday.
"I am happy with my performance to reach the semi-finals for the first time (in Halle)," said Rublev.
On Saturday, world number seven Rublev, will face Georgian qualifier Nikoloz Basilashvili, 30th in the world, who beat Lloyd Harris of South Africa 6-4, 7-6 (7/5).
The 20-year-old has built some momentum in Halle having beaten his childhood idol Federer in the second-round and will play either France's Ugo Humbert or Sebastian Korda of the USA in the other semi-final.
Auger-Aliassime is bidding to end a streak of eight losses in ATP finals in the last two years, including last week's Stuttgart grass court tournament.
Andrey Rublev (RUS x4) bt Philipp Kohlschreiber (GER) 7-6 (7/4), 6-2