Zverev defies boo-boys to stun Federer, sets up Djokovic final

Tennis - ATP Finals - The O2, London, Britain - November 17, 2018 Germany's Alexander Zverev in action during his semi final match against Switzerland's Roger Federer Action Images via Reuters/Andrew Couldridge

LONDON (Reuters) - Alexander Zverev claimed one of most significant wins of his fledgling career as he beat Roger Federer to reach the ATP Finals title match but became an unwitting pantomime villain in bizarre scenes at the 02 Arena on Saturday.

The 21-year-old German upstart produced some dazzling tennis and thoroughly deserved a swashbuckling 7-5 7-6(5) win against the six-time champion to set up a Sunday showdown with world number one Novak Djokovic.