Too many questionable selections for my liking.
McMahon is great at Super Rugby level, but has been nowhere near as effective at test level. Remember also that he is not long back from serious injury. He is a big gamble v the ABs, and I think would much better suit a bench spot than a starting position.
Hanigan is there essentially for his lineout capabilities. His play around the ground is not yet at test standard.
Beale/Kerevi centre combination could well be a disaster in the making. Neither is reknown for their tackling abilities and defensively will likely have a detrimental impact on the team structures. SBW and Crotty will have a field day.
Phipps on the bench is a bad bet. He is sorely out of form and despite what some posters go on about, he was not back to form at the end of the Super Rugby season. Remind me how he/the Tahs went in their last outing against the Force?
Those concerns aside, most of the players selected are at least competitive with their one-on-one opponents, but the whole offered by the ABs is very likely to be far greater than that of the Wallabies. I think this match has the hallmarks of a very embarrassing outing by the Wallabies.