The Halle Open and the Queens Club Championships are held at the same time, and the two are considered the key warm-up tournaments for Wimbledon.
The 20-time Grand Slam champion is feeling “pumped up” as he is targeting to reach the second week of Wimbledon.
Berrettini beat tournament favourite, Cameron Norrie, in the final as Humbert beat Andrey Rublev in Halle.
The fourth-seeded Russian was stretched to the limits but survived the contest against qualifier Nikoloz Basilashvili at the Noventi Open semifinals.
The 20-year-old Canadian continues his impressive run, beating Giron in straight sets to reach the last four. Elsewhere, Rublev also moves into the Halle semifinals.
The Swiss maestro won the first set, but was unable to build on the momentum as he lost the next two sets to Felix Auger-Aliassime in the second round.
The Swiss maestro won the opening set but failed to build on that momentum as he lost the remaining two sets to bow out of the tournament.
The 23-year-old Russian ousts Jordan Thompson in straight sets and will next play Philipp Kohlschreiber.