Robin Soderling is the latest big seed out of Australian Open

MELBOURNE // Alexandr Dolgopolov produced a stunning five-set upset over the fourth seed Robin Soderling to reach the Australian Open quarter-finals.

The pony-tailed Ukrainian completed a shock 1-6, 6-3, 6-1, 4-6, 6-2 win in Melbourne with a heavily whipped forehand to become only the second man from his country to reach the last eight of a grand slam.

Swede Soderling, the French Open runner-up the past two years, took a medical time-out in the fourth set to treat blisters on his foot before going on to level a cliff-hanger fourth round match.

However, he was quickly staring down the barrel in the deciding set, Dolgopolov drilling another big forehand past the Swede to break for 3-1.

The 23-year-old was making only his fourth grand slam appearance but held his nerve to record his first win over a top 10 player and the biggest upset of the year's first major so far.