All eight seeds in action have progressed through to the second round at the New Zealand Tennis Championships in Auckland.
The day was highlighted by a couple of retirements due to scorching temperatures at the Albany tennis centre.
The longest match of the day saw Auckland qualifier Filippo La Cava take Wellington's Finley Hall to three sets in 2hrs 49minutes before Hall won 6-7(4) 7-5 6-4.
Top New Zealand junior Ajeet Rai cruised to a 6-1, 6-2 win over qualifier Takuma Ohashi and will meet wildcard Anton Bettink for a place in the quarter-finals.
The top four seeds in the men's and women's draws each received byes into the second round.
Defending champion Artem Sitak opens his campaign Wednesday against Wellington teenager Isaac Beecroft who had some good results in Junior ITF events in October.
Top seed Finn Tearney plays Dunedin hopeful Paddy Ou who advanced to the second round when his opponent Te Kani Williams retired late in the third set due to the heat.
All four women's seeds in action made impressive starts with 5th seed Oleksandra Kalachova, 6th seed Nina Paripovich, 7th seed Emilia Price and 8th seed Elys Ventura notching up straight-set wins.
Women's top seed Joanna Carswell gets her campaign underway Wednesday against qualifier Kaitlyn Wilkinson while second seed Claudia Williams will meet Louise Waite.
Third seed and former WTA player Sascha Jones plays Sarah Weekley in her opening match.
The singles champions will receive wildcards into ASB Classic qualifying.