Fourth-seeded Milos Raonic of Canada hit 22 aces, including on match point, to beat Donald Young of the United States 6-4, 6-7 (5), 7-6 (2) Thursday to reach the quarterfinals of the Swiss Indoors.
Raonic earned the only break of the match to take the opening set and then dominated the final-set tiebreaker, converting his first of four match points to seal the win after nearly 2 hours, 20 minutes.
Raonic, who beat Young in two sets in Washington earlier this year, next faces Belgium’s David Goffin.
Top-seeded Roger Federer played Denis Istomin later.
Eighth-seeded Ivo Karlovic also advanced after coming from a set down to defeat qualifier Kenny De Schepper of France 6-7 (6), 6-4, 6-3 in just under 2 hours.
The Croatian will face Benjamin Becker in the quarterfinals. The German eased through after Mikhail Kukushkin, who had upset Stanislas Wawrinka in the opening round, retired when trailing 6-7 (3), 7-6 (4), 4-0.
Borna Coric set up a quarterfinal against childhood idol Rafael Nadal as the 17-year-old Croatian comfortably beat Andrey Golubev 6-4, 6-4.
