Daniil Medvedev destroyed a net camera as he battled to control his emotions in a five-set thriller against world number 418 Kasidit Samrej in the first round of the Australian Open.

Medvedev, a three-time finalist in Melbourne, furiously smashed his racquet against the camera in the middle of the net after falling behind in the third set.

The Thai wildcard was in sight of the biggest win of his career - as well as handing Medvedev the most surprising defeat of his - on his Grand Slam debut.

But Samrej, who has never previously competed at an ATP Tour event, started to struggle physically and the Russian regained his composure to win 6-2 4-6 3-6 6-1 6-2.

The fifth seed has made five-set matches a habit in Melbourne, with this his fourth in a row after blowing a two-set lead against Jannik Sinner in last year's final.

"I know that I play better when I play more tennis, so why play one hour 30 [minutes]?" Medvedev joked during his on-court interview.

"It's minimum three hours to feel my shots better and to have a good sensation."

Medvedev began shouting at his coach as early as the second set before his emotions really came to the fore in the third when he went a break down.

After an unfortunate net cord went against him, Medvedev repeatedly whacked the middle of the net, destroying his racquet and the camera.

The visual feed from the camera immediately cut out and a ball kid had to sweep up the pieces that had broken off.

Just as Medvedev looked on course for his earliest exit in Melbourne since his Grand Slam debut in 2017, Samrej faltered physically.

"Second and third set, I couldn't touch the ball. Full power, everything in, I didn't know what to do," Medvedev added.

"I watched his matches and I didn't see his level, so I was surprised. If he plays like this every match, life will be good - money, girls, casino, whatever."

Elsewhere, French veteran Gael Monfils outlasted his 21-year-old compatriot Giovanni Mpetshi Perricard in another five-set thriller.

Monfils, 38, became the oldest ATP Tour champion last week when he won the ASB Classic in Auckland.

"I don't really look up my age," said Monfils, who won 7-6 (9-7) 6-3 6-7 (6-8) 6-7 (5-7) 6-4.

"It is just a number. I try to avoid to think about it, but I can tell you that tomorrow morning I will be more 48 than 38."

Meanwhile, fourth seed Taylor Fritz dropped just five games in a dominant 6-2 6-0 6-3 win against fellow American Jenson Brooksby.