Spanish teenager Carlos Alcaraz will become the youngest player in the top five of the ATP rankings since Rafael Nadal in 2005 after reaching the Hamburg Open final.
Alcaraz, 19, beat Slovak Alex Molcan 7-6 (7-2) 6-1 and will face Lorenzo Musetti for the title on Sunday.
The Miami Open and Madrid Open champion has won his five previous Tour finals.
“I have a lot of confidence for the final and hope to make it six-for-six,” said Alcaraz after his latest clay win.
“Lorenzo is playing really well. It’s going to be a great final.”
Nadal was under a month away from turning 19 when he became fifth in the world for the first time.
Alcaraz is a huge admirer of Nadal, beat him in Madrid and has also trained with the 22-time Grand Slam champion.
He will overtake Norwegian Casper Ruud when the updated rankings are released on Monday.
Musetti, 20, reached his first Tour final with a 6-3 7-6 (7-3) victory over Francisco Cerundolo.
The world number 62 said he was surprised by the form that has earned him a meeting with the top seed in Hamburg, following his first-round exit at the Swedish Open.
“I was not playing my best tennis last week,” said Musetti. “I didn’t expect to be in the final here.”