Taylor Fritz might be out of the U.S. Open, but he's not going quietly. The world No. 10 took to social media Thursday with a blistering critique of Wilson's retail tennis balls, claiming they're a far cry from the ones used in actual tournaments.

After spending weeks practicing and playing with the official Wilson US Open balls during the hard-court swing—including stops in Washington, Cincinnati, and the Open itself—Fritz says he knows exactly how those balls should feel off his racket. The problem? The ones he's been training with since coming home are, in his words, "literal green-dot kids' balls."

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"They are sold, marketed, and labeled as the same balls, but the way they come off my racket and feel couldn't be more different," Fritz wrote on X. "After that many weeks using the tournament balls, I know exactly how they respond. The balls I'm practicing with feel incredibly soft, dead, and going nowhere."

Fritz was quick to rule out a bad batch, saying he tried balls from multiple cases and got the same result. He also noted that other players he's spoken to since the Open have described the same issue.

This isn't just a minor annoyance for Fritz—it's a fundamental problem that affects how players train and prepare. "There was consistency, and any small differences could usually be explained by the court or conditions," he explained. "Over the last year and a half, though, I've noticed such a significant difference between retail balls from both Wilson and Dunlop and their tournament equivalents, which are supposed to be identical, that it completely changes how you want to construct points and take risks on shots."

Fritz's frustration comes at the end of a season that had high hopes but ultimately fell short. He entered the U.S. Open as a potential dark horse, but blew a two-set lead to Francisco Cerundolo in the third round. "I don't know how I let that happen today," he said after the match. He failed to reach the quarterfinals at any Grand Slam this year, though he did capture the Citi Open title in August.

The rant has sparked conversation across the tennis world, with many fans and analysts weighing in on the discrepancies between retail and tournament balls. Some have pointed out that this isn't a new issue, but Fritz's candidness has brought it back into the spotlight.

As Fritz looks to turn his season around and potentially qualify for the ATP Finals, he's hoping Wilson and other manufacturers take note. For now, he's left practicing with balls that feel nothing like the ones he'll face in competition—a frustration that no amount of ranking points can fix.

For more on the latest tennis controversies, check out Madison Keys' epic US Open meltdown and Paige Paul's latest swimsuit snap.