American Taylor Fritz, the No 3 seed, won against Australian lucky loser Adam Walton 6-3, 7-5 to advance to the last eight of the Miami Masters at the Hard Rock Stadium on Tuesday night.

Fritz, ranked No 4, will play Italian Matteo Berrettini, the No 29 seed, next.

Ahead of his victory, the American defeated Italian Lorenzo Sonego (7-6 (2), 6-3) and Canadian Denis Shapovalov, the No 27 seed (7-5, 6-3).

Walton, ranked No 89, won against Italian Luciano Darderi (6-4, 6-4) and edged out wildcard Chak Lam Coleman Wong (7-6 (6), 4-6, 6-4) in the previous rounds of the Miami Open.

Miami Masters 1000, other last 16 results (Hard Rock Stadium, hard, USD 9.193.540, most recent results first):

• Alexander Zverev vs. Arthur Fils
• Tomas Machac vs. Jakub Mensik
• Matteo Berrettini beat Alex De Minaur (10): 6-3, 7-6 (7)
• Novak Djokovic (4) beat Lorenzo Musetti (15): 6-2, 6-2
• Francisco Cerundolo (23) beat Casper Ruud (5): 6-4, 6-2
• Sebastian Korda (24) beat Gael Monfils: 6-4, 2-6, 6-4
• Grigor Dimitrov (14) beat Brandon Nakashima (31): 6-4, 7-5