Coco Gauff’s coach, US legend Brad Gilbert joins the backlash against Yulia Putintseva after she ‘humiliated’ a US Open ball girl

Brad Gilbert has become the latest tennis legend to hit out at Kazakhstan player Yulia Putintseva for her disrespectful behavior towards a ball girl at the US Open.

Putintseva, the world No. 32, allowed her frustration to boil over during her third-round defeat to Jasmine Paolini at Flushing Meadows Sunday.

However, it was a ball girl at the USTA Billie Jean King National Tennis Center who suffered at the hands of Putintseva’s wrath, earning the 29-year-old player boos from the crowd.

With the Kazakhstan player losing the first-set and going 4-2 down in the second, there was an ugly moment when a ball girl attempted to throw balls towards her before she took serve.

Putintseva stared at the ball girl blankly with her arms down by her side, making no effort to catch the balls and instead just looking at them as they rolled away from her feet.

She has since taken to social media to apologize for her actions after many on social media criticized her for her treatment of the ball girl.

US tennis legend Gilbert, who coaches last year’s champion Coco Gauff, joined the likes of Boris Becker in slamming Putintseva for the ugly moment.

‘Tremendous effort from the Ball girl to raise her arms and hold her position, bravo,’ posted Gilbert in response to a tweet branding Putintseva’s actions ‘disrespectful.’

‘I know frustration can happen to any players but ball persons should never ever get dissed, since so many former players were a ball kid as well.

He also mockingly quipped that Putintseva should have been shown a ‘straight red card.’

The tennis commentator was just one of many condemning Putintseva, with Becker calling her out for her ‘terrible behavior.’

‘Who does Putintseva think she is… terrible behavior towards the ball girl,’ wrote Becker, who won the US Open in 1989

His tweet was in response to one which described it as an ‘ugly moment’ during the match.