Canadian seventh seed Denis Shapovalov has been dumped out of the Auckland tennis classic on the first night of the men's tournament.
Shapovalov was beaten by Portugal's Joao Sousa in three sets, 4-6 6-4 6-4.
Sousa will face Great Britain's expat New Zealander Cameron Norrie in the next round after he beat Frenchman Benoit Paire 6-3 6-2 and they will be joined by Germany's Jan- Lennard Struff, who was leading Laslo Djere 7-7 (7-5) 2-0 when the Serbian retired.
Former champion Philipp Kohlschreiber eased his way into the second round with victory over Bradley Klahn.
The 2008 winner, who has made it to the quarter-finals and beyond on eight occasions, took a little under 90 minutes to seal a 6-4 7-6 (7-2) win over the American qualifier.
Tennys Sandgren and Matteo Berrettini also made it through with 6-3 6-4 victories over Maximilian Marterer and Mackenzie McDonald respectively, while 21-year-old Taylor Fritz needed three sets to see off Marius Copil 4-6 6-3 6-4 and land a date.