Tennis: Alexander Zverev guaranteed to become world No. 1

Also in Vienna, Carlos Alcaraz reached the quarter-finals with a 6-1, 7-6 win over Nikoloz Basilashvili. He will face Tommy Paul.

In Basel, Arthur Fils came from a set down to beat Alex Michelsen (4-6, 6-3, 7-6) in two hours and 19 minutes. He will n... [541 chars]

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