Canada's Denis Shapovalov advanced to the quarterfinals of the Swiss Indoors tennis tournament with a 6-3, 7-6 (4) win over Roberto Bautista Agut on Thursday in Basel, Switzerland.

Shapovalov used a strong service game to overcome the Spanish veteran for the win at the ATP 500 event in just under one hour 40 minutes.

The 25-year-old from Richmond Hill, Ont., fired 18 aces, including one to set up match point in the second-set tiebreaker, and won 79 per cent of first serves and 63 per cent of second-serve points.

Shapovalov, a former top-10 player on the ATP Tour, entered this year's Swiss Indoors ranked 95th and will appear in just his second quarterfinal of the season.

He improved to 3-0 against Bautista Agut, who he beat in July en route to a quarterfinal appearance in Washington.

Shapovalov will next face the winner of a match scheduled for later Thursday between defending champion Felix Auger-Aliassime of Montreal and France's Giovanni Mpetshi Perricard.

WATCH | Shapovalov extends unbeaten streak against Bautista Agut: 

Denis Shapovalov moves into Swiss Indoors quarterfinals

Denis Shapovalov of Richmond Hill, Ont., downed Spain's Roberto Bautista Agut 6-3, 7-6(4) to advance to the quarterfinals of the Swiss Indoors tournament in Basel, Switzerland.