ASB Classic tournament director Karl Budge announced the decision Tuesday, saying work on hosting the tennis tournaments had been well advanced but logistical and safety issues had taken precedence.
Humbert has been the giant killer this week beating second-seeded Denis Shapavalov and 20th-ranked Isner
Former World No 1 Caroline Wozniacki will have no further preparation before her final career appearance at the Australian Open after withdrawing Monday from the traditional warm-up tournament at Kooyong.
Auckland Open 2020: Serena Williams defeats compatriot Jessica Pegula in final to break three-year title drought
Williams now has the opportunity to sweep both titles at the Auckland Tennis Centre, having also advanced to the doubles final with good friend Caroline Wozniacki.
Auckland Open 2020: Serena Williams battles past Christina McHale in three sets; Coco Gauff eliminated by Laura Siegemund
Williams dropped a set for the first time in singles or doubles this year and at times Thursday appeared to be fully stretched by the 88th-ranked McHale before finding the edge to win in just over two hours
ASB Classic: Serena Williams, Caroline Wozniacki win first doubles match in straight sets in Auckland
Serena Williams, Caroline Wozniacki became doubles partners for the first time as the friends, former World No. 1s teamed to win a first round match at the ASB Classic in Auckland.
ASB Classic 2020: Jelena Ostapenko pulls out due to personal reasons; Svetlana Kuznetsova to also miss tournament
Russian Kuznetsova, 34, was set to face Serena Williams at the event, a traditional warmup for the Australian Open, but pulled out due to a viral illness, while 22-year-old Ostapenko withdrew for personal reasons.
Roberto Bautista Agut won his second Auckland Classic title with a 6-1, 4-6, 7-5 victory over second seed Juan Martin Del Potro.
Auckland Classic: Juan Martin del Potro gets past David Ferrer, sets up final against Roberto Bautista Agut
Juan Martin del Potro overcame a stubborn challenge from David Ferrer to clinch their semi-final 6-4, 6-4 at the Auckland Classic.
Serena Williams mixed flashes of form and occasional bouts of frustration as she ended four months on the sidelines with a 6-3, 6-4 win over Pauline Parmentier in the first round at Auckland.