Halle Open: 'It's never easy playing the greatest' Zverev on Federer ahead of Halle
Number one and number two seeds Roger Federer and Alexander Zverev shared their thoughts on Monday ahead of their 2019 debut on grass at the Halle Open.
Federer will start to tournament against Australia's John Millman, while in the first round Zverev will face Netherlands' Robin Haase.
Federer has won in Halle nine times - his last victory was in 2017 against Zverev.
The Swiss also played the final last year, losing to Borna Coric.
