Everyone Is Blaming Drake for Serena Williams' Surprise Loss at the U.S. Open

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Looks like Drake isn't exactly Serena Williams' good luck charm.

The 28-year-old Canadian rapper was, once again, spotted taking in one of Serena's tennis matches on Friday -- after the two were snapped cuddling at a Cincinnati restaurant last month, reigniting couple rumors -- and was there when she surprisingly lost to Roberta Vinci in the semifinal round of the U.S. Open.

Clad in a green baseball jacket, Drake was also seated behind former Arrow star Colton Haynes.

WATCH: Drake and Serena Spotted Cuddling, Reignite Couple Rumors

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Vinci ended up winning the match in three sets, which a source tells ET got pretty intense. "Serena was yelling after each shot she won," the source observed. "Then Roberta at one point threw her hands up when she won and basically was taunting the crowd -- because everyone was cheering only for Serena."

Not surprisingly, it didn't take long for the Drake backlash to begin.

Still, the rapper was at least a good sport in the audience, especially when they played his hit, "Hold On, We're Going Home."

"Drake looked happy," an eyewitness tells ET. "He was laughing and smiling when the song came on."

Serena's loss, however, is going to take a lot more to get over, as she was on her way to becoming only the sixth player in history to win all four grand slams in a year. The 33-year-old tennis champ "shook hands and bailed" after the surprising upset, our source says, and then told the media she would not talk about how she feels about the match. She opted only to praise Vinci, whom she said "played the best game of her life."

But Serena shouldn't feel too bad -- she won her sixth consecutive Wimbledon title in July, and even got props from first lady Michelle Obama on Friday.

"So proud of you, @SerenaWilliams. What you did this year was amazing. -mo #USOpen2015," Obama tweeted.

WATCH: FLASHBACK -- Serena Williams Shares the Three Keys to Winning the U.S. Open

Watch the video below for more on Drake and Serena's rumored romance.

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