New York, United States, 27 August 2013 | AAP

Bernard Tomic says he’s happy to have quietened the doubters with a fighting five-set comeback win at the US Open.

After being accused of tanking at last year’s tournament in a second round loss to Andy Roddick, Tomic rallied from two-sets-to-one and a service break down to beat Spain’s Albert Ramos 6-3 3-6 4-6 7-6(1) 6-3 in a first-round tussle lasting almost four hours on Monday.

Tomic’s reward for his fighting performance is a second-round match against Daniel Evans after the British qualifier surprisingly ousted 11th seed Kei Nishikori 6-4 6-4 6-2.

The world No.52 was thrilled with his victory.

“I was probably one or two points away from being out of the tournament, so being able to turn that around and find something inside you to win this match was very, very good for me,” Tomic said.

“I dug deep and gave myself a chance, as opposed to, you know, quitting. I take that as confidence into my next round.”

The 20-year-old has won five of his six five-set matches on the ATP Tour.

He was in command during the first set, grabbing early control with a flurry of drop shots and powerful forehands to race out to a 5-0 lead.

In the sixth game, he took his foot off the pedal to allow Ramos into the set but quickly regained control to take it out in just 33 minutes.

Momentum shifted strongly the Spaniard’s way in the second set as he lifted his first-serve percentage and broke Tomic to level the match.

In the third set, Tomic dropped his service early and was unable to crack Ramos despite numerous opportunities, eventually succumbing 6-4.

Tomic was looking down the barrel, but the Queenslander clawed back a service break and capitalised on the Spaniard’s dwindling first-serve percentage – and what looked to be a leg injury – to win a one-sided tiebreaker.

In the final set, Tomic played smart tennis, moving Ramos around the court before grabbing the decisive break in the fifth game.

Kyrgios, Matosevic ousted by Spanish seeds

Later on Monday in New York, Australian teen Nick Kyrgios fell in straight sets to No.4 seed David Ferrer.

Playing in an evening match on Louis Armstrong Stadium, the 18-year old battled hard in the opening set before succumbing to a 7-5 6-3 6-2 defeat.

A qualifier into the tournament, Kyrgios was making his main draw debut at the US Open.

Across on Court 17, Marinko Matosevic went down in four sets to 19th seed Tommy Robredo.

After dropping the opening set, the 56th-ranked Matosevic levelled scores by clinching a second set tiebreak.

Yet Robredo, showing the form that has seen him jump from outside the top 100 to No.22 and reach the French Open quarterfinals in 2013, went up a level to run out a 6-3 6-7(6) 6-3 6-2 winner.