Basel - Fourth-seeded Milos Raonic of Canada has hit 23 aces, including on match point, to beat Donald Young of the United States 6-4, 6-7 (5), 7-6 (2) on Thursday to reach the quarter-finals 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.
Roanic, who beat Young in two sets in Washington earlier this year, next faces Belgium's David Goffin.
Top-seeded Roger Federer played Denis Istomin in other second round action.
Results from fourth day of the Swiss Indoors ATP tournament (x denotes seeded player):
Benjamin Becker (GER) bt Mikhail Kukushkin (KAZ) 6-7 (3/7), 7-6 (7/4), 4-0 - retired
Milos Raonic (CAN x4) bt Donald Young (USA) 6-4, 6-7 (5/7), 7-6 (7/2)
Borna Coric (CRO) bt Andrey Golubev (KAZ) 6-4, 6-4