Australian wildcard Kimberly Birrell stunned second seed Emma Navarro on Wednesday while the doubles act of Novak Djokovic and Nick Kyrgios came to a shuddering halt at the Brisbane International.
La Liga's strict spending limits restricted Olmo's initial registration to 31 December, 2024 after Barcelona made the Spain playmaker their flagship signing last summer.
Arsenal have paid the price for an inconsistent spell that leaves them well adrift of top spot, prompting Arteta to issue as rallying cry prior to their last game of 2024.