Melbourne - Unheralded Ukrainian Alexandr Dolgopolov produced the Australian Open's biggest upset Monday when he shocked fourth seed Robin Soderling in five sets to reach the quarter-finals on debut.
The 46th-ranked Ukrainian recovered from a set down to stun the Swede in the fourth round and reach the last eight in just his fourth appearance at a major.
Soderling had shaped as one of the men to beat here and cruised through the first set in just 21 minutes on the back of his powerful serve.
The Swede's serve had been broken just once in the first three rounds, but the 22-year-old Dolgopolov stormed back into the match with successive breaks in the second set to level the match.
The rot continued in the third set for Soderling, as he won just one game. The Swede grew increasingly frustrated as he struggled to find a way to combat Dolgopolov's court coverage and bold groundstrokes.
However, he managed to level the match and broke Dolgopolov in the first game of the decider.
But it was a false dawn, with the youngster breaking straight back and claiming the next four games.
Two superb passing shots set up match point for Dolgopolov on the Soderling serve, and although the Swede staved off three match points, he dumped a forehand into the net to end the match after 2hr 36min.
The ponytailed Ukrainian, who spent most of December in Australia preparing for the tournament, hit 50 winners to Soderling's 34, and made just 23 unforced errors to his opponent's 51.