Sabalenka’s tempo and energy was an excessive amount of for world quantity 160 Iatcenko, who managed simply three winners in comparison with the 24 put away by the prime seed.
Iatcenko seemed a bundle of nerves in the greatest match of her career, however composed herself to get on the scoreboard for 5-1 and instantly broke out right into a relieved smile.
It was merely respite as Sabalenka held to like in lower than 90 seconds to clinch the opening set.
Despite solely being on courtroom for twenty-four minutes, Iatchenko determined she wished a rest room break to vary her equipment – however extra probably for a psychological reset than the rest.
Sabalenka saved unfastened whereas she waited by practising her serves and maintained her rhythm as she surged a double break forward for 3-0 in the second set.
It was not all plain-sailing for Sabalenka as she misplaced serve in a sloppy fourth sport, however reasserted her authority with two extra breaks as Iatchenko was taught a harsh lesson.
The Russian can console herself with the data she has gained precious expertise towards the world quantity one on the greatest courtroom on the planet – and a bumper paycheck.
Coming into the US Open, she had earned $300,000 (£220,000) in her career however takes one other $190,000 (£140,000) dwelling from New York to reinvest into her future.
Earlier on Wednesday, third seed Pegula continued her quest for a maiden Grand Slam singles title with a cushty victory over fellow American Sofia Kenin.
Pegula additionally has a shot of changing Sabalenka as world quantity one if she wins the title, as does fourth seed Coco Gauff, and saved her dream alive with a 6-3 6-1 win.
There have been additionally straight-set wins for Wimbledon runner-up Karolina Muchova, two-time main semi-finalist Marta Kostyuk and teenage American sensation Iva Jovic as the patten of few shocks in the girls’s draw over the opening two rounds continued.