New York, NY, USA, 1 September 2015 | AAP

Daria Gavrilova wished she’d faced off with five-time Grand Slam champion Maria Sharapova rather than a lowly-ranked rookie after making a shattering exit from the US Open.

Australia’s most exciting young women’s prospect appeared to have been gifted a passage through to the second round in New York when Sharapova withdrew from their scheduled showcourt clash with a leg injury.

Alas, free-swinging 18-year-old Daria Kasatkina ambushed her on court 11 to post a 6-2 4-6 7-5 upset win over the world No.37.

Having stunned Sharapova in Miami earlier this year to spark a huge rankings rise, Gavrilova said she would have been much more comfortable taking on the third-seeded former champion.

“I obviously had a plan to play Maria and in the end I ended up playing this girl who I didn’t know anything about,” Gavrilova said.

“I am obviously very disappointed.”

A hamstring strain sustained early in the third set also undermined the 21-year-old’s bid to capitalise on a stack of seeds bombing out on the opening day to open up Gavrilova’s section¬†of the draw.

“I couldn’t move as well and that is my biggest strength, so that didn’t help at all,” Gavrilova said.

But after establishing a 3-1 lead in the deciding set, Gavrilova ultimately paid the price for having her scheduled first-round encounter moved from Armstrong Stadium.

With no Hawk-Eye available on the outside court, the former world junior champion was livid at being unable to challenge a call when a framed forehand winner from Kasatkina flew over her head to break the Australian for 6-5 in the third set.

Gavrilova was adamant the ball was out and protested to the chair umpire, but later sportingly refused to make a fuss.