(Photo credit: Susan Mullane-Imagn Images)

Tallon Griekspoor of the Netherlands used his strong serve to upset No. 2 seed Alexander Bublik of Kazakhstan 6-3, 7-6 (4) in the Round of 16 at the Dubai Duty Free Tennis Championships on Wednesday.

Griekspoor fired off 14 aces without a double fault and won 35 of 40 first-service points (87.5%). He also saved three break points and had just 10 unforced errors to 30 winners. Bublik had 29 winners but committed 23 unforced errors.

In another pair of upsets, Frenchman Arthur Rinderknech toppled No. 4 Jack Draper of Great Britain 7-5, 6-7 (4), 6-4, and Jenson Brooksby beat No. 7 Karen Khachanov of Russia 7-6 (6), 6-4. In similar fashion to Griekspoor, Rinderknech racked up 20 aces without one double fault.

No. 1 seed Felix Auger-Aliassime of Canada moved on to the quarterfinals by beating French qualifier Giovanni Mpetshi Perricard 6-4, 6-4, while Russian third seed Daniil Medvedev defeated Swiss veteran Stan Wawrinka 6-2, 6-3. No. 5 seed Andrey Rublev of Russia beat Frenchman Ugo Humbert 6-4, 6-7 (5), 6-3, while a pair of Czech natives, No. 6 Jakub Mensik and No. 8 Jiri Lehecka, advanced in straight sets.

BCI Seguros Chile Open

A pair of upsets saw the fourth and seventh seeds bow out in the Round of 16 in Santiago, Chile.

Germany's Yannick Hanfmann racked up a 28-12 edge in winners in beating No. 4 seed Camilo Ugo Carabelli of Argentina 6-4, 6-3. Italian qualifier Andrea Pellegrino benefited from his opponent's 50 unforced errors, including 11 double faults, in a 7-6 (3), 6-7 (2), 6-3 win over No. 7 seed Francisco Comesana of Argentina.

Lithuania's Vilius Gaubas rallied past Croatia's Dino Prizmic 5-7, 7-5, 6-3 in a match lasting three hours, two minutes. The final match of the day was set to pit No. 2 seed Luciano Darderi of Italy against Mariano Navone of Argentina.

--Field Level Media