MELBOURNE, Jan. 17 (Xinhua) -- Less than 48 hours ago, Swiss talent Belinda Bencic, was riding high after knocking out last year's Australian Open finalist, Venus Williams, in straight sets.

But on Wednesday, the 20-year-old came crashing back down to earth, exiting the tournament in the second round at the hands of world number 124, Luksika Kumkhum, 6-1, 6-3.

The 24-year-old Thai was superb, showing fierce power at the baseline and having tremendous success attacking the net.

"It's the first time that I've reached the third round," Kumkhum said. "I kept telling my coach and family I'm trying so hard to pass the second round, so I'm so happy."

With many expecting the second round match up to be a walk in the park in comparison to Venus Williams, Bencic quickly talked down any speculation that she underestimated her opponent.

"I've played her a few times and it's always been really difficult," Bencic explained. "I had re-set and focused but it was a tough second round."

"It was not the issue that I was still thinking about the Venus win," she added.