The 2018 Australian Open began Monday in Melbourne, though most Americans might hope it began at a different date.

Within the first four hours of play beginning, three of the top 13 seeds in women’s singles – all from the US – lost their first round matches in a morning session American tennis fans will want to forget quickly.

The upset started with the very first match at Margaret Court Arena, with reigning US Open champion Sloane Stephens facing Shuai Zhang of China. The American started very well, and found herself serving for the match at 5-4 in the second set. But Zhang was able to not only break serve, she forced that set into a tiebreak, and took control in the third set. Stephens seemed to lose focus after that critical break, and having now lost eight straight matches since her win at Flushing Meadows, the question will now when she can get back to winning ways.

Venus Williams entered the tournament with high expectations as well, having reached the final in Melbourne a year ago. But Belinda Bencic of Switzerland took control midway through the first set, unaffected by a rain delay of nearly a half-hour, going on to win 6-3 7-5. It’s the third time in five seasons Williams has lost in the first round in Australia. Meanwhile, Bencic, who in the first round to Serena in 2017, may now be considered a favorite to reach the third round.

Coco Vandeweghe gained an advantage early in her first-round match with Hungarian Timea Babos before the rain delay, with the first set going to a tiebreak, which Babos won. Prior to the second set, the American became involved in an argument with chair umpire Fergus Murphy, which ended with a violation being issued for time-wasting. Vandeweghe received another penalty later in the second set, as Babos continued her momentum to record the win in straight sets.

Monday wouldn’t fare much better for the favored Americans in men’s singles, as both John Isner & Jack Sock lost in four sets to their respective opponents. Meanwhile, Rafael Nadal and Nick Kyrgios had little trouble progressing to the second round.

Tuesday’s schedule sees Roger Federer and Novak Djokovic take the court for the first time, along with Madison Keys, who is now the last remaining player from last year’s US Open semifinals. Will there be more upsets to come over the next few days in Melbourne?