(Photo credit: Mike Frey-Imagn Images)

Reigning champion Denis Shapovalov needed just 66 minutes to advance to the Nexo Dallas Open quarterfinals, defeating the United States' Aleksandar Kovacevic 6-4, 6-4 on Thursday.

Shapovalov, a Canadian who is seeded seventh, slammed 22 aces and committed just one double fault. He won 94% of his first-serve points and never faced a break point.

British qualifier Jack Pinnington Jones also moved into the quarterfinals by eking out a 7-6 (5), 4-6, 7-6 (4) win over Eliot Spizzirri, a former All-American at the University of Texas.

Croatia's Marin Cilic topped the United States' Ethan Quinn 7-6 (4), 6-3.

In second-round action Thursday night, second-seeded Ben Shelton of the United States opposed France's Adrian Mannarino, and fifth-seeded Tommy Paul of the U.S. was due to meet Serbia's Miomir Kecmanovic.

ABN Amro Open

Spain's Jaume Munar saved a set point in the opening-set tiebreaker and went on to upset fifth-seeded Karen Khachanov of Russia 7-6 (8), 3-6, 6-3 in the second round at Rotterdam, Netherlands.

Each player lost his serve just once in the match. Munar got the decisive break to go up 5-3 in the third set, then closed the victory in the next game.

The top three seeds all advanced to the quarterfinals. No. 1 seed Alex de Minaur of Australia ousted Switzerland's Stan Wawrinka 6-4, 6-2. Canada's Felix Auger-Aliassime, the 2022 Rotterdam champ, downed Serbian lucky loser Hamad Medjedovic 6-4, 6-4. Third-seeded Alexander Bublik of Kazakhstan beat Germany's Jan-Lennard Struff 7-6 (2), 4-6, 6-3.

France's Ugo Humbert and the Netherlands' Botic Van De Zandschulp logged straight-set wins.

IEB+ Argentina Open

A pair of seeded Argentines moved into the quarterfinals with straight-set victories in Buenos Aires.

Fourth-seeded Sebastian Baez got past Peru's Ignacio Buse 6-4, 6-3, and sixth-seeded Camilo Ugo Carabelli prevailed 6-2, 7-5 in an all-Argentine matchup against Mariano Navone.

Second-seeded Luciano Darderi of Italy trounced Chile's Tomas Barrios Vera 6-1, 6-3, and Spain's Pedro Martinez defeated Argentina's Juan Manuel Cerundolo 7-6 (5), 6-4.

--Field Level Media