Roger Federer set up a final with David Goffin at the Halle Open in pursuit of a 10th tournament title.
The 37-year-old Swiss defeated Pierre-Hugues Herbet 6-3 6-3 in the semi-final in Germany.
Federer is preparing for the Wimbeldon tournament as he attempts to win the English Grand Slam tournament for the eighth time. He last won Wimbledon in 2017.
He has surived a rocky path to the final after dropping a set against earlier tournament opponents Roberto Bautista Agut and Jo-Wilfied Tsonga.
Belgian David Goffin defeated Matteo Berrettini 7-6 (7-4) 6-3 to reach his first ATP final since 2017.
"The last couple of days were hard, that's why I am thrilled to be in the final," Federer, who was facing his 337th different opponent, said.
"Otherwise he would have had a couple of chances... I played well from the start. That was the key to stay focused from the start. I'm playing well, more aggressive... so, it's a great feeling this week to be in the final."