Frances Tiafoe, Taylor Fritz, Jessica Pegula and Madison Keys drew locks on the cameras after their wins and now we know what the reason for it is.
Along with Keys and Tiafoe, Fritz and Pegula played on the US team at the United Cup. Since the team won it, the event was a success. Locks were a recurring theme. They constantly made jokes about staying 'locked in' in order to win.
[You] just have to stay locked. It's the whole thing with the United Cup guys. Just staying locked in. I made a joke about it with the guys at the United Cup asking them before the match, ‘Are you locked?’ It's definitely become a thing. It's so funny how true it is because staying between the lines, it's amazing how well you play. It's a funny thing with everybody.
The way Fritz drew the lock caused some chatter on social media because people were unsure what it was. He had to quickly clarify on social media that it was supposed to be a lock but he can't draw.
It is a Team USA thing. Unfortunately, Taylor's was so bad. So I guess for whatever reason today we decided that we would all lean in and try to explain what Taylor was trying to do for him. So, yeah, it's just us being dumb.