Wimbledon champ and world No. 1 Ash Barty was ousted from the Olympics in a stunning opening-round upset

• The Tokyo Olympics tennis tournament is officially underway.

• World No. 1 and reigning Wimbledon champ Ash Barty suffered a stunning upset in the opening round.

• The Australian star lost in straight sets to world No. 48 Sara Sorribes Tormo of Spain.

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The Tokyo Olympics tennis tournament already has a massive upset just hours into the competition.

World No. 1 and reigning Wimbledon champion Ash Barty was stunned in the opening round of the tournament on Sunday. She dropped straight sets against Spain's Sara Sorribes Tormo - a player who has never advanced past the second round of a Grand Slam tournament.

"It was a tough day. A disappointing day. I can't lie about that," Barty told the Seven Network, per ESPN. "I can't hide behind that fact that I wanted to do really well here. Today wasn't my day."

Barty was off from the very start of the match, dropping two of her first three service games and finding herself in a 4-1 hole after just 30 minutes. The two-time Grand Slam champion was visibly frustrated with her output as she surrendered a whopping 55 unforced errors in the affair.

The Australian superstar positioned herself to bounce back in the second set and even jumped out to a 3-2 lead. But once she blew the opportunity to go up a break in that sixth game, the rest of her game plan seemingly unraveled.

Barty only took one more game in the match.

She'll still have a chance to medal in the doubles competition, where she's partnered up with Storm Sanders. The pair will play China's Yi-Fan Xu and Zhaoxuan Yang Monday at 4 a.m. ET. Sorribes, meanwhile, will continue onto the second round of the singles tournament, where she'll face France's Fiona Ferro Monday at midnight ET.

Check out the recap of Barty's singles loss to the Spaniard below:

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