The first round of the US Open wrapped up Tuesday, with 2011 champion Sam Stosur among the winners.
Ana Ivanovic scored her WTA-leading 48th match win of the year against America's own Alison Riske.
Petra Kvitova, the No.3 seed this fortnight, cruised past Kristina Mladenovic in her opening match.
Kvitova could take World No.1 if she wins the title and Serena Williams falls before the quarters.
WTA Rising Star Eugenie Bouchard got her 17th Grand Slam match win - the most of anyone on the tour.
The day wasn't without upsets though - Marina Erakovic stunned the No.20 seed, Svetlana Kuznetsova.
And over on the outside courts, a 15-year-old American was pulling off the biggest upset so far...
CiCi Bellis rallied from 3-1 down to take out No.12 seed and Aussie Open finalist Dominika Cibulkova.
Bellis was interviewed on court by ESPN's Darren Cahill after her hard-fought win over Cibulkova.
Victoria Azarenka made a fantastic return to one of her best events, edging Misaki Doi in three sets.
Anastasia Pavlyuchenkova, a former quarterfinalist here, was also among the winners on Tuesday.
There were some legends in the house too, including a now-retired former Wimbledon champion...
And basketball legend Michael Jordan, who was interviewed by WTA legend Mary Joe Fernandez for ESPN.
Three of the biggest legends in the history - including Billie Jean King - met up afterwards...
Meanwhile, one of the WTA's all-time greats, Serena Williams, was winning her opening match in NYC.