Sportswear giant Adidas has been slammed for an embarrassing ‘wardrobe malfunction’ that saw their pinup boy Stefanos Tsitsipas’ olive green shorts become a sweaty mess during his Australian Open semi-final clash with Daniil Medvedev.

A humid 30C in Melbourne saw Tsitsipas’ yellow and green ensemble disintegrate into a sweaty mess as his shorts showed up an unmissable dark patch between the legs.

Stefanos Tsitsipas struggles in the humidity of Rod Laver Arena. Photo: Tennis Australia/ JAY TOWN

“Millions of dollars of material technology research and they don’t do the ‘does it look like he sh*t himself when he sweats’ test? Astounding,” one posted on Twitter.

“Those shorts are very problematic. Adidas has a lot to answer for,” another said.

“Stefanos Tsitsipas looks pretty flat out there, and his butt looks incredibly wet,” tweeted tennis journo Ben Rothenberg.

Stefanos Tsitsipas waves to the crowd after his loss to Daniil Medvedev. Photo: Tennis Australia/ ROB PREZIOSO

“Both concerning in their own ways.”

And the Tennis Podcast site tweeted: “For me, the strangest storyline of this match so far: Tsitsipas left the court for a break between the second and third sets. Why DIDN’T he change his sweaty, sweaty shorts?”

Stefanos Tsitsipas serves against Daniil Medvedev. Photo: Tennis Australia/ MARK PETERSON