Del Potro waltzes into Vienna quarters
Former US Open champion Juan Martin Del Potro won through into the quarter-finals of ATP Vienna.
The Argentine world number 15 beat opponent Philipp Petzschner 6-3 6-4 with a solid performance, breaking his opponent once in each set and saving all four break opportunities that the German earned against him.
Seventh seeded Nikolai Davydenko crashed out, however, losing his first round match 3-6 6-0 7-6(2) against Belgian Steve Darcis.
Jarkko Nieminen of Finland also made the second round by beating Dutch world number 40 Robin Haase 7-6(3) 6-4.