BMW rising star Chaz Davies rode to an emphatic double win on Sunday at the same circuit where he took his maiden World Superbike podium in 2012, after two potential winners were forced back to the pits.
Aprilia works rider Eugene Laverty and Kawasaki's Tom Sykes each experienced technical problems - while they were on the lead - during lap 4 and 5 respectively. Laverty, however, went back went back on track later on to test the RSV4 after the work done by his crew.
South African riders, meanwhile had mixed fortunes at the intimidating 5.344km Motorland Aragon circuit.
RACE 1
Davies kept it together after his rivals fell by the wayside to come home a clear winner, 5.216sec ahead of Laverty's team mate Sylvain Guintoli.
BMW's chances for a one-two went west when Marco Melandri picked up a false neutral that cost him three places, although he managed to fight his way back from fifth to third by chequered flag.
A technical problem on the last lap stopped Aprilia privateer Davide Giugliano from finishing fourth, while Ducati veteran Carlos Checa came home seventh behind Jonathan Rea (Honda), Loris Baz (Kawasaki) and Jules Cluzel (Suzuki).
RACE 2
Davies was unstoppable in the in the Aragon sunshine as he repeated his first-race success, well clear of Guintoli, after Aprilia team leader Laverty lost the front of his RSV4 at Turn 2 on the very first lap after outdragging Davies and Sykes into Turn 1.
Sykes held off a strong challenge from Giugliano to take third, with Melandri fifth - not as competitive as in race 1 but still able to finish ahead of Baz and Cluzel. Both French riders had an outstanding Race 2, as Baz started from the last position on the grid and Cluzel moved off from the pit lane.
Checa, on his home circuit, finished eighth.
Guintoli's two seconds and Laverty's two DNF's moved the French rider to the top of the championship standings on 85 points, ahead of Davies' 63 and Laverty on 45.
RESULTS - RACE 1
1 Chaz Davies (Britain) BMW S1000 RR - 39min50.332
2 Sylvain Guintoli (France) Aprilia RSV4 Factory +5.216sec
3 Marco Melandri (Italy) BMW S1000 RR +7.089
4 Jonathan Rea (Britain) Honda CBR1000RR +8.196
5 Loris Baz (France) Kawasaki ZX-10R +14.417
6 Jules Cluzel (France) Suzuki GSX-R1000 +18.332
7 Carlos Checa (Spain) Ducati Panigale 1199R +24.306
8 Michel Fabrizio (Italy) Aprilia RSV4 Factory +25.884
9 Leon Haslam (Britain) Honda CBR1000RR +36.721
10 Ayrton Badovini (Italy) Ducati Panigale 1199R +44.129
11 Max Neukirchner (Germany) Ducati Panigale 1199R +51.424
12 Federico Sandi (Kawasaki ZX-10R) +1min09.217
13 Ivan Clementi (Italy) BMW S1000 RR +1min14.091
14 Vittorio Iannuzzo (Italy) BMW S1000 RR +1min48.328
RACE 2
1 Chaz Davies (Britain) BMW S1000 RR - 37min52.691
2 Sylvain Guintoli (France) Aprilia RSV4 Factory +5.036sec
3 Tom Sykes (Britain) Kawasaki ZX-10R +7.677
4 Davide Giugliano (Italy) Aprilia RSV4 Factory +12.549
5 Marco Melandri (Italy) BMW S1000 RR +19.766
6 Loris Baz (France) Kawasaki ZX-10R +23.855
7 Jules Cluzel (France) Suzuki GSX-R1000 +26.926
8 Carlos Checa (Spain) Ducati Panigale 1199R +31.593
9 Leon Haslam (Britain) Honda CBR1000RR +35.308
10 Ayrton Badovini (Italy) Ducati Panigale 1199R +44.497
11 Michel Fabrizio (Italy) Aprilia RSV4 Factory +53.071
12 Max Neukirchner (Germany) Ducati Panigale 1199R +55.223
13 Alex Lundh (Sweden) Kawasaki ZX-10R +1min32.995
14 Ivan Clementi (Italy) BMW S1000 RR +1min41.979
15 Jonathan Rea (Britain) Honda CBR1000RR +1 lap
POINTS(after 2 of 14 rounds)
1 Sylvain Guintoli (France) Aprilia RSV4 Factory - 85 points
2 Chaz Davies (Britain) BMW S1000 RR - 63
3 Eugene Laverty (Ireland) Aprilia RSV4 Factory - 45
4 Marco Melandri (Italy) BMW S1000 RR - 43
5 Michel Fabrizio (Italy) Aprilia RSV4 Factory - 42
6 Tom Sykes (Britain) Kawasaki ZX-10R - 38
7 Jules Cluzel (France) Suzuki GSX-R1000 - 33
8 Loris Baz (France) Kawasaki ZX-10R - 31
9 Jonathan Rea (Britain) Honda CBR1000RR - 30
10 Leon Haslam (Britain) Honda CBR1000RR - 29
WORLD SUPERSPORT
Kawasaki veteran Fabien Foret came home alone to win the 600cc race after top contender Sam Lowes went out on the last lap with a gearbox problem on his Yamaha R6. Foret's 16th career put the 2002 World Supersport champion back at the top of the standings.
A string of crashes, technical issues and unforeseeable happenings punctuated the race starting with a braking issue that put an early end to reigning champion Kenan Sofuoglu's chances of a second win.
Kawasaki's Kevin Coghlan than moved into the lead, only to xcrash out at Turn 7. Hot rookie Michael van der Mark (Honda) scored his second consecutive podium finish with a solid second ahead of Kawasaki privateers Luca Scassa, Andrea Antonelli and Riccardo Russo, and his team mate Lorenzo Zanetti.
South Africa's Sheridan Morais (Honda), after qualifying on the front row, crashed out at Turn 2 on the first lap, while Mathew Scholtz battled home stone last, a lap down, on a privateer Suzuki.
RESULTS
1 Fabien Foret (France) Kawasaki ZX-6R - 37min10.286
2 Michael van der Mark (Netherlands) Honda CB600RR +6.595sec
3 Luca Scassa (Italy) Kawasaki ZX-6R +9.909
4 Andrea Antonelli (Italy) Kawasaki ZX-6R +10.110
5 Riccardo Russo (Italy) Kawasaki ZX-6R +11.950
6 Lorenzo Zanetti (Italy) Honda CBR600RR +12.658
7 Jack Kennedy (Ireland) Honda CBR600RR +16.105
8 Vladimir Leonov (Russia) Yamaha R6 +16.800
9 Roberto Rolfo (Italy) MV Agusta F3 675 +25.034
10 L Marconi (Italy) Honda CBR600RR +29.106
21 Mathew Scholtz (South Africa) Suzuki GSX-R600 +1 lap
DNF
24 Sheridan Morais (South Africa) Honda CBR 600RR +18 laps
WORLD SUPERSTOCK
BMW's Sylvain Barrier opened his defence of his 2012 Superstock 1000 title in the best possible way by romping home to a three-second win from former World Superbike Ducati rider Niccolò Canepa.
Barrier took the lead down the long main straight on lap 16 and quickly opened enough of a gap that Canepa was unable to strike back.
Barrier's sixth win in the series completed a perfect weekend for the French youngster, after qualifying on pole.
Canepa's Superstock comeback was a success as the experienced rider from Genoa led the early part of the race and tried not to lose contact with Barrier, but a lack of horsepower on the straight didn't help.
The final spot on the podium went to Argentinian Leandro Mercado on a Pedercini Kawasaki, back for a full Superstock 1000 and showing some real confidence on track.
It was a wasted opportunity for Jeremy Guarnoni (Kawasaki), who was closing in on the leading four in the early stages but ran wide and dropped back to 10th. He did well to make his way back into contention by the end, snatching fourth from Ducati privateer Eddi La Marra with a brave overtaking manoeuvre at Turn 16 on the last lap that gave hiome a 0.050sec advantage at the line.
Potential podium finisher Lorenzo Savadori, on the second Pedercini Kawasaki, crashed out of third on lap seven, after posting a new Superstock lap record of 2min01.074 on lap three.
South Africans Greg Gildenhuys (BMW) and David McFadden (Honda) turned in solid performances to finish 10th and 11th respectively.
RESULTS
1 Sylvain Barrier (France) BMW S1000 RR - 24min22.239
2 Niccolo Canepa (Italy) Ducati Panigale 1199R +3.255
3 Leandro Mercado (Argentina) Kawasaki ZX-10R + 5.852
4 Jeremy Guarnoni (France) Kawasaki ZX-10R +10.437
5 Eddi La Marra (Italy) Ducati Panigale 1199R +10.477
6 Romain Lanusse (France) Kawasaki ZX-10R +21.436
7 Ondrej Jezek (Czech Republic) Ducati Panigale 1199R +27.271
8 Marco Bussolotti (Italy) BMW S1000RR + 30.099
9 Enrique Ferrer (Spain) BMW S1000RR +30.488
10 Greg Gildenhuys (South Africa) BMW S1000RR +31.586
11 David McFadden (South Africa) Honda CBR1000RR