First day thrillers
Around the grounds at Melbourne Park a collection of players had to dig deep to go the distance to earn their second-round ticket.
No.5 seed Andrey Rublev roared in relief as he closed out a pulsating 7-5, 6-4, 3-6, 4-6, 7-6[10-6] triumph over Brazilian Thiago Seyboth Wild.
Similarly, No.12 seed Taylor Fritz had to claim the final two sets to edge past world No.93 Facundo Diaz Acosta. Argentina's Francisco Cerundolo and Australian Christopher O'Connell claimed marathon five-set wins, along with world No.89 Daniel Elahi Galan's five-hour 2-6, 6-3, 7-6(3), 4-6, 7-6 [10-8] rollercoaster with home hope Jason Kubler.
Over to the women's draw and Roland-Garros 2021 champion Barbora Krejcikova overcame wild card Mai Hontama 2-6, 6-4, 6-3.
More qualifiers also made a name for themselves on this sizzling Sunday. Brenda Fruhvirtova posted her first Grand Slam victory with a 2-6, 6-4, 6-3 scoreline with Ana Bogdan. The 16-year-old's reward is a second round blockbuster with world No.2 Sabalenka.
Another qualifier Alina Korneeva, girls' champion in Melbourne and Roland-Garros last season, produced a head-turning 4-6, 6-3, 6-2 win facing world No.52 Sara Sorribes Tormo.