A week on from winning the Cologne Indoors, Alexander Zverev will face Diego Schwartzman in the Cologne Championships final.
Alexander Zverev and Diego Schwartzman had to dig deep to reach the Cologne Championships semi-finals.
Gilles Simon sprung a surprise on Denis Shapovalov in Cologne, where Diego Schwartzman made serene progress to round three.
Top seed Alexander Zverev has won 11 of his last 12 hard-court matches, but it was not all plain sailing against John Millman on Wednesday.
John Millman will be the first man to try to stop Alexander Zverev claiming back-to-back titles in Cologne, while Jannik Sinner also won.
Seeds made early exits in Antwerp and Cologne as Frances Tiafoe and Steve Johnson claimed unexpected wins.
A victory on home court at the St Petersburg Open means Andrey Rublev will scale new heights in the ATP rankings on Monday.
Andy Murray is struggling for form and fitness, and the latter has caused him to withdraw from the Cologne event that starts on Monday.
Alexander Zverev won the Cologne Indoors, his first 2020 title, as Felix Auger-Aliassime's wait for Tour glory goes on.
Marco Cecchinato lost to Laslo Djere in a competitive final in Sardinia that lasted nearly two hours and 20 minutes.