Tennis - Australian Open - Melbourne Park, Melbourne, Australia - 22/1/17 Switzerland's Roger Federer celebrates winning his Men's singles fourth round match against Japan's Kei Nishikori. REUTERS/Edgar Su
MELBOURNE (Reuters) - Seeing world number 50 Mischa Zverev and wildcard Denis Istomin upset the top two players in the world at Melbourne Park shows more players believe they can take shake up the established order and that can only be good for tennis, says Roger Federer.
Zverev's win over world number one Andy Murray on Sunday came on the heels of Istomin's second round victory over six-times champion Novak Djokovic, results which not only surprised Federer but saw the odds of him winning the title shortened.
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