North Whyalla lost their third player to a leg injury in a horror three week span, with Steven Mills going down early on in their eight-point loss to Central Whyalla at Bennett Oval on Sunday.
The Magpies had previously lost key players Daniel Chapman and Tyson Richman to leg breaks, while Mills is understood to have suffered a severely dislocated ankle in the final minutes of the first quarter.
North were leading by 18 points at the first break but Mills' injury put a dent in their squad, and Central fought their way back into the game to lead 35-26 at the half.
A scrappy third quarter saw Central clinging to a two-point lead going into the final term, where three goals was enough to see the Roosters claim a 9.7 (61) to 8.5 (53) win.
Veteran forward Scott Collison was key for the Roosters, slamming home four majors, while Matthew Woolford added three. Lachie Tansell, Brayden Woolford and Marko Tansell were among their best.
It wasn't the only upset of the round, with West Whyalla losing their second game for the season in a shock 20-point loss to a hungry Weeroona Bay outfit on Saturday at Bennett Oval.
The game wasn't one for the spectators, as the two teams combined for just 78 points. A goalless first quarter set the tone for the match, with both sides being inaccurate in front of goal.
West held an 11-point lead heading into the final quarter when the Bays came alive. The Tigers kicked five goals in the fourth while holding West scoreless to record an unexpected 7.7 (49) to 4.5 (29) win.
Michael Baker had three vital goals for Weeroona Bay, while Lee Ringland added two and Steven Jason, Brandon Delgiacco and Max Zbierski were in their best.
Saul Tonkin, Blake Turner Wiebreck and Clay Crompton (two goals) battled hard for West, but the side was missing a number of important players.
Meanwhile Roopena emerged victorious in the battle of the cellar dwellers, blowing the game wide open in the first quarter to set up a 59-point victory over South Whyalla.
The Roo's first win of the season was a real team effort with nine individual goal-kickers chipping in, including David Smith (three goals), Kane Grund (two), Kynan Buhlmann (two) and Zak Thompson (two).