Stefanos Tsitsipas saved three set points before beating Grigor Dimitrov 7-6, 6-4 to join Olympic champion Alexander Zverev in the second round of the 
Vienna Open.

Zverev also advanced in straight sets but had to rally from 5-2 down in the second to overcome Filip Krajinovic 6-2, 7-5. The top-seeded Tsitsipas, who lost to Dimitrov in the second round last year, was 6-3 down in the tiebreaker before reeling off five straight points to claim the opening set.