Around the grounds
Notable seeds such as two-time runner-up Daniil Medvedev, Stefanos Tsitsipas, Jannik Sinner, Maria Sakkari and Petra Kvitova all advanced unscathed in straight sets.
In the battle of the former champions, 2012-13 winner Victoria Azarenka edged past Sofia Kenin 6-4, 7-6(3).
However, 2014 champion Stan Wawrinka fell in five sets over the net from Slovakian Alex Molcan.
Ukrainian Marta Kostyuk sent No.28 seed Amanda Anisimova out 6-3, 6-4, whilst Czech charge Jiri Lehecka turned heads with a 6-3, 6-3, 6-3 win facing Croatia’s 21st seed Borna Coric.
South African Lloyd Harris inched past No.17 seed Lorenzo Musetti in a fifth set match tie-break, whilst No.6 seed Felix Auger-Aliassime needed four sets to overhaul his fellow Canadian Vasek Pospisil.
There was a plethora of five-set thrillers, with home wildcards Rinky Hijikata and John Millman going the distance to secure their second round tickets.