Matt Reid was quick to spot it as Thanasi Kokkinakis also reacted.
Unfortunately for the fan, Lopez is engaged to model Sandra Gago and the pair look inseparable.
US OPEN'S CHINESE PLAYER STUFF UP
China-United States relations aren't exactly at their best right now and this incident from the opening day of the US Open may not help things.
Less than a week since President Trump proclaimed himself "the chosen one" when it came to his trade war with China, an embarrassing gaffe involving a Chinese player took place at Flushing Meadows.
While it's not uncommon for Chinese players on the WTA Tour to have similar surnames both Saisai Zheng and Shuai Zhang have been around the tour a long time — enough to be recognisable by tennis authorities anyway.
Which makes this error just slightly unforgivable.
While Zheng was out on court getting destroyed by Venus Williams in a 6-1 6-0 demolition she also had to suffer the indignity of officials putting a photo of her compatriot Zhang up on the scoreboard next to her name.
The photo of Williams was also less than flattering.
Thankfully for Zheng at least the indignity was short-lived as it took 39-year-old Williams just a tick over an hour to dispatch of Zheng as she wound back the clock with a wicked 25 winners that showed she can still go at a major.
Williams is in decent form of late too, having made the quarter-finals in Cincinnati earlier this month where she beat top 10 star Kiki Bertens and Croatia's Donna Vekic along the way, before losing to Madison Keys.
Zheng described Williams as "playing like a top-10 player" right now, that's despite a lean year when the elder Williams sister has been beaten in the first round at both Roland Garros and Wimbledon.
She was not alone with tennis scribe Jose Morgado calling the performance from Williams "vintage".
The easy win for Williams sends her into a tough second round match against fifth-seeded Ukrainian Elina Svitolina, who got by American Whitney Osuigwe 6-1 7-5.
