Britain's Cameron Norrie secured his spot in the quarter-finals of the ASB Classic in Auckland with a straight-sets win over Joao Sousa.
The 23-year-old saved all six break points faced to battle past his Portuguese opponent 7-6 (7/5) 6-4 in an hour and 35 minutes.
A closely-fought first set saw Norrie edge ahead in the tiebreak, before he went on to convert his first and only break point of the match in the third game of the second set.
The single break of serve was enough for the British wild card to claim the victory and set up a meeting with American Taylor Fritz in the last eight.
Fritz, ranked 50 in the world, had earlier dismissed top seed John Isner 7-6 (7/3) 7-6 (7/5).
PA
