Top seed Stefanos Tsitsipas of Greece saved three set points in the first set to take down Bulgaria's Grigor Dimitrov 7-6 (6), 6-4 in a first-round match Tuesday at the Erste Bank Open in Vienna, Austria. Tsitsipas withstood 10 aces from Dmitrov and saved all four break points he faced in the one-hour, 42-minute win. He next faces Frances Tiafoe, who defeated Tsitsipas earlier this year in straight sets at Wimbledon. Tiafoe reached the second round with a 6-4, 6-4 win over Serbian