Milos Raonic says there isn't a huge difference between the way Novak Djokovic is playing now and the way he was playing when he was dominating the game a few months ago.

Raonic fell to Djokovic in straight sets at the ATP World Tour Finals on Tuesday, his eighth consecutive defeat to the Serb.

"He's pretty much where he's always been," the Canadian said. "Sometimes he slips up one or two points—sometimes he lets it be three points now."

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Djokovic won six titles in the first half of the season, but has only captured one since winning the French Open. A few more errors are the issue, Raonic suggested.

"I think that's the only difference," he said. "Before it was very rare that you would see two successive poor points from him."

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The win over Raonic put Djokovic into the semifinals of the Tour Finals.

Djokovic will play Gael Monfils in his final round-robin match on Thursday, and Raonic will take on Dominic Thiem.