Wrexham lost 2-1 to Sydney on Tuesday, as they turned in a lethargic performance down under in pre-season.
After 18 minutes, a fine, curling free-kick from James McClean was inadvertently turned into his own net by Corey Hollman, as the Welsh side were rewarded for strong early work.
Before half-time, Rathbone was substituted with a potential muscular injury, as Sydney screamed for a penalty after a handball in the area. While it was not given, a corner was instead, and Sydney equalised; Danny Ward made a superb save from a close-range header but Alexander Popovic pounced to fire the rebound into the roof of the net.
Just after the hour mark, manager Phil Parkinson rang the changes, introducing essentially an entirely new team, including a new goalkeeper in the form of Callum Burton.
Seven minutes later, Wrexham should have had the lead, as Jack Marriott first forced a great one-on-one save from Harrison Devenish-Meares, then Jay Rodriguez headed just wide.
Sydney punished them swiftly, and in the 74th minute, Joseph Lacey took aim from range and curled an effort beyond the flapping Burton, who got a strong hand to the ball but could not keep it out.
Wrexham attempted to find an equaliser, but could not find the required rhythm to put together a decent chance. As a result, Parkinson's side left Sydney defeated.