The enigmatic Bernard Tomic has recorded his first win over a top-50 player in almost a year just weeks after bombing out of the French Open to lucky loser Marco Trungelliti.
The former world No.17 beat sixth seed and world No.44 Robin Haase 6-3 7-5 at the Rosmalen Grass Court Championships in the Netherlands.
Tomic's last win over one of the game's elite came on June 29 last year when he beat Mischa Zverev in straight sets at Eastbourne.
The German, however, turned the tables a week later at Wimbledon, eliminating Tomic in the first round.
Tomic, ranked 181st in the world, will face fourth seed Fernando Verdasco in the next stage after the Spaniard ousted Russian Daniil Medvedev 6-4 6-1.
Verdasco will be hoping to end his winless streak against Tomic, who has come out on top in their last five meetings.
Tomic will be joined in the quarter-finals by countryman Matt Ebden, who beat third seed and defending champion Gilles Muller 6-3 7-5.
Ebden next faces Romania's Marius Copil in the quarter-finals on Friday.
Alex Bolt will bid to join the Australian pair in the last eight when he faces Mackenzie McDonald of the US on Thursday.
Frenchmen Adrian Mannarino and Richard Gasquet, the top two seeds, will also play their second-round matches against compatriot Jeremy Chardy and Russian Evgeny Donskoy respectively.