British number one Johanna Konta suffered a shock defeat by world number 123 Bernarda Pera in the second round of the Australian Open.

The American won 6-4 7-5 to claim only her second win at Grand Slam level.

Ninth seed Konta had reached the quarter-finals and semi-finals on her past two visits to Melbourne Park.

“It’s a bit frustrating but I’m still taking good stuff from this,” Konta said. “I don’t feel, by any means, it’s a massive catastrophe.”

“I play every event to be there until the end, so I definitely don’t want to be going home this early.

Konta, 26, has now won just three of 11 matches since reaching the Wimbledon semi-finals in July.

She saved four match points on a hot and blustery afternoon but framed a smash on the fifth to give Pera the biggest win of her career.

The 23-year-old lost in qualifying and only made it into the main draw of a Slam for the first time as a lucky loser, after another player withdrew through injury.

The Croatia-born American goes on to face Barbora Strycova in the third round after the Czech 20th seed beat Spain’s Lara Arruabarrena 6-3 6-4

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