Venus Williams has been a pro for 20 years, playing 826 matches on four continents, but Tuesday she recorded a first.
She played a match at the Rogers Cup in Montreal.
The 34-year-old Californian upended Russian Anastasia Pavlyuchenkova 6-1, 3-6, 6-2 in a match delayed by a power outage at the stadium.
Williams has made several appearances at the Rogers Cup, but all have been in Toronto.
Her first appearance in La Belle Province will be memorable not only for the victory, but for the electronics-free ambience reminiscent of amateur tournaments or a weekend at the tennis club.
The chair umpire signalled the score directly to the players in the third set, unable to make announcements on the system at Uniprix Stadium.
The power outage was neighbourhood-wide and afternoon matches continued with blank scoreboards.
Williams, ranked 26th on tour, next faces 164th-ranked Yulia Putintseva of Kazakhstan.