SERENA WILLIAMS suffered another US Open final nightmare last night.

The American superstar, cheered on by Meghan Markle who jetted into the Big Apple to cheer on her pal, didn’t lose the plot like she did 12 months ago after Naomi Osaka and the officials drove her wild.

Instead, it was 19 year-old Bianca Andreescu, another brilliant star in the making, who was simply superior and bagged her first Grand Slam with a stunning 6-3, 7-5 triumph.

The no15 seed’s near faultless display in her first major showpiece leaves Williams still waiting for that elusive, all-time record equalling 24th crown.

Andreescu, amazingly playing in the main draw at the US Open for the first time, may be the new kid on the block.

But the teenager was nerveless, breaking Williams in the opening game and then, crucially holding to take an early lead.

She wasn’t intimidated even if there was an 18 year age difference between herself and the home favourite – the largest age gap for two finalists in Open era.

Williams flickered into life and sent a packed Arthur Ashe Stadium wild after mounting an comeback from 5-1 down to break twice – which included saving one Championship point – and claw her way back into the match.

Yet another two chances came up for the Canadian to seal the deal, and although Williams saved one with an ace, Andreescu slapped home a rocket forehand to complete a remarkable triumph.