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Zverev needed one hour and 25 minutes on court to beat Martinez 6-2 6-4, ending a run that saw the Spaniard eliminate seeds Matteo Arnaldi and Francisco Cerundolo.

The home favourite earned his first break in the third service game and followed up with another in the seventh, also winning 92 per cent of his first-serve points in the opener as Martinez failed to apply any sustained pressure.

Zverev broke again at the start of the second set before producing crucial holds in the second and seventh games, reaching his third straight clay-court final after also going all the way at the Masters 1000 in Rome and the French Open.

He will face Fils in the final after the Frenchman overcame Sebastian Baez by a 6-2 6-2 scoreline in just 67 minutes, reaching his first ATP 500 final.

Zverev became just the second German to win the Hamburg title last year after Michael Stich in 1993, and he could now become the first to defend the trophy with Stich falling to Yevgeny Kafelnikov in the 1994 semi-finals.