29 June, 2017
Federer, 35, despatched Russian Karen Khachanov 6-4, 7-6 (7/5) on Saturday to move into the final.
In a battle of generations, it was Federer who turned back the clock to teach 20-year-old Zverev a lesson in grass-court tennis with an accomplished 6-1 6-3 victory in just 52 minutes.
The 18-times grand slam champion is in ominous form and won in Halle without dropping a single set all week.
"I thought it was extremely close, especially that second set. I felt good and never let up", said Federer, who dropped just nine points on his serve. "I'm still just very happy how I was able to close it out in the 'breaker".
There is no doubt that Zverev is going to have to produce something magical against Federer today if he is to get the win.
Murray put injury concerns behind him to forge an encouraging run to the semi-finals at the French Open but lost to world No90 Jordan Thompson in the first round of the Aegon Championship at Queen's Club last week.
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"I really had to fight in defence, but maybe it's not so bad to survive like this on grass".
Switzerland's Roger Federer, right, with the victor trophy and Germany's Alexander Zverev, left, with the trophy for the second place, frame model Eva Herzigova, after the final match of the Gerry Weber Open tennis tournament in Halle, Germany, Sunday, June 25, 2017.
"Roger is the best player of all time on grass, it will be a very hard match", said the young German.
Alexander Zverev failed to stop Federer's momentum as the Swiss sewed up the match on his first match ball to reap his 92nd career title.
Federer, whose first success at Halle came in 2003, has won 92 career titles from 140 finals. While Federer will be expected to get his ninth title here at the Halle Open, Zverev had proven that he can compete with the best as he defeated Novak Djokovic earlier this year.