Jurgen Melzer has upset fourth-seeded Roberto Bautista Agut 6-3 7-5 in the first round of the ATP tournament in Vienna.
The Austrian two-time event winner, who has dropped to 417th after a five-month layoff following shoulder surgery, played only his sixth match of the season at ATP level.
In front of a home crowd of 7500, Melzer broke the 14th-ranked Bautista Agut when the Spaniard served for the second set at 5-4, and added another break to close out the win.
Melzer, who won the event in 2009 and 2010, joined fellow Austrian Dominic Thiem in the second round.
The third-seeded Thiem defeated Jurgen's younger brother, Gerald Melzer, 6-0 6-3.
Thiem next plays Viktor Troicki of Serbia, who converted the only break point in the final set to complete a 4-6 7-6 (5) 7-5 comeback win over Kevin Anderson of South Africa.
Defending champion David Ferrer had to play only five games to advance to the second round after Kyle Edmund pulled out with a hip injury.
Ferrer next plays Joao Sousa of Portugal, who led Pablo Cuevas 6-3 3-0 when the Uruguayan pulled out with an apparent knee injury.
Also, 2011 champion Jo-Wilfried Tsonga had 11 aces and avoided break points while beating German qualifier Benjamin Becker 6-3 6-4.
Also, Feliciano Lopez, who won his maiden title in Vienna in 2004, saved a match point before taking the last three games in a 6-4 2-6 7-5 win over seventh-seeded Lucas Pouille.
Lopez will play John Isner of the USin the second round.
