The 35-year-old, who is already lifting his 9
th title at Halle,
won
6-1 6-3 in just 53 mins.
Federer's victory earned him a fourth title of the year,
a tally only matched by his long-time rival Rafael Nadal.
Federer won the Australian Open - his first Grand Slam success in five years - in January
despite not playing in the previous six months, then claimed the BNP Paribas Open at Indian Wells in March
and, two weeks later, the Miami Open.
bbc news
Roger Federer beats Alexander Zverev in Gerry Weber Open final
won 6-1 6-3 in just 53 mins.
Federer's victory earned him a fourth title of the year,
a tally only matched by his long-time rival Rafael Nadal.
Federer won the Australian Open - his first Grand Slam success in five years - in January
despite not playing in the previous six months, then claimed the BNP Paribas Open at Indian Wells in March
and, two weeks later, the Miami Open. bbc news