Although there will be some interest in that battle, the scrap for fifth and sixth will be even more intense.
Melbourne Heart go into their away match with Adelaide United in fifth place and know they will finish there or, at worst, sixth.
The Heart are a point ahead of Newcastle Jets and Sydney FC who meet in the winner-take-all blockbuster.
But a draw in Sydney would be enough for the Jets to survive with a better goal difference.
The added concern for Adelaide, Central Coast and in particular Brisbane Roar, who need to beat Gold Coast United to have any chance of claiming the minor premiership, is three midweek Asian Champions League matches.
Adelaide are at home to Gamba Osaka and Brisbane away to Beijing Guoan tomorrow night while Central Coast entertain Nagoya Grampus Eight on Wednesday night.
Despite the shocker against the Victory - the only team to put three goals in the Phoenix net this season after an earlier 3-1 result - the Phoenix can take some comfort in their record against Newcastle, Melbourne Heart and Sydney FC this season.
In nine games against the three teams they can face in sudden death, the Phoenix have won all three against the Jets, all three against Sydney and one against the Heart with a 1-1 draw and a 1-0 loss - both away.
Rather than worrying about whom they might face in that elimination game, Herbert has to find a return to winning ways after two shoddy efforts in Melbourne in the space of six days.
The 1-1 draw with Melbourne Heart was a salvage job after a terrible first half while the blowout against the Victory was up with the worst 90 minutes the Phoenix have turned in this season.
Now, back at home and against a Mariners side who have won only two of their past eight games and face a short turnaround after their midweek Champions League encounter, the Phoenix must regroup and turn around the two losses they have had with the Mariners this season.
That all five games in the final weekend will have a bearing on the play-offs is testament to what has been a closely fought contest.