Premier League clubs shattered their transfer record of £3.1 billion ($4.2 billion) spent in one window as Manchester City splashed out £125 million to Chelsea for Enzo Fernandez and signed Iliman Ndiaye from Everton.
World number two Elena Rybakina and former champion Coco Gauff breezed into the second round of the US Open on Tuesday as men's top seed Alexander Zverev launched his campaign.
Manchester City have been chasing Fernandez for several months and the Argentina international is on the verge of moving to the Etihad Stadium on deadline day.
Fernandez-Pardo agreed a long-term contract with Newcastle, who are rebuilding their squad following the close-season departures of Anthony Gordon, Bruno Guimaraes and Sandro Tonali.