Haaland's Norway struggles against Austria
Erling Haaland has scored 15 goals for club and country this season, but he could not help his nation avoid a humbling defeat to Austria.
Haaland, standing in for injured skipper Martin Odegaard, watched on as his nation suffered a second-half collapse at the Raiffeisen Arena.
The Manchester City striker became Norway's all-time top scorer with a brace in its 3-0 win over Slovenia midweek, taking his total to 34 goals in 36 games, and threatened to add to that tally when he struck the post early on.
However, a dominant start by the host was rewarded when Marko Arnautovic thundered his side in front in the eighth minute with a fierce effort off the crossbar.
Norway found themselves level six minutes before half-time when Alexander Sorloth headed Julian Ryerson's free-kick beyond the on-rushing Patrick Pentz.
Andreas Hanche-Olsen's foul on Christoph Baumgartner inside the box proved to be the beginning of the end for Norway after the break, with Arnautovic stepping up to score the resulting penalty.
Austria increased its lead soon after through Philipp Lienhart's header, with Stefan Posch nodding the hosts 4-1 in front after being picked out at the back post by Marcel Sabitzer.
The rout was complete in the 71st minute, with Sabitzer again the architect, teeing up Michael Gregoritsch for yet another header to send Austria joint-top of Group B3 alongside Norway.