Pompey will try to cause an Emirates FA Cup upset when they host Arsenal in the fifth round on Monday evening.
But they are the 6/1 underdogs with Sky Bet to beat their Premier League opponents inside 90 minutes.
The visitors – who were knocked out of the Europa League on Thursday night – can be backed at 2/5, with the draw at 7/2.
It finished 4-1 to the Gunners when the sides last met back in 2009 and Kenny Jackett’s men getting revenge by that scoreline carries mighty odds of 200/1.
Perhaps a more realistic outcome would be a 1-0 success at 20/1 or a 1-1 stalemate to take the tie to extra-time at 14/1.
And if you think it will go all the way to penalties, then either side triumphing after a shoot-out is priced at 25/1.
There are several price boosts, with John Marquis scoring at any time moving from 3/1 to 4/1 or Ronan Curtis netting from outside the box shifting from 18/1 to 22/1.
Andy Cannon has been in impressive form of late and is available at 14/1 to have two or more shots on target.
In the first goalscorer market, Curtis is the 17/2 favourite, with Ellis Harrison, Ryan Williams and Christian Burgess at 9/1, 16/1 and 50/1 respectively.
Meanwhile, those who reckon the Blues will end up lifting the trophy at Wembley in May can back them at 200/1.
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Please note that in-stadia betting is no longer available at Fratton Park.