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Kenny Jacketts side took advantage of second-placed Barnsley and third-placed Sunderland both dropping points.
How Sunderland and Barnsleys promotion run-ins compare ahead of dramatic League One finale
They played out a goalless draw at Oakwell, meaning Pompey are six points off the automatics with nine games remaining.
Portsmouth are not far away either, three teams in this league have had unbelievable seasons, Ross told the Sunderland Echo.
So it is not easy, far from it, it makes it even more challenging to gain automatic promotion but we have kept ourselves in it.
We have a lot of points to play for. The game didnt pan out as I imagined due to the weather conditions.
The Blues have sold more than 30,000 tickets so far for their return to the national stadium since 2010.
ByDom Toner Published on March 13, 2019 Share Tweet Comment Sunderland defender Jack Baldwin has been a regular starter this campaign at the Stadium of Light, but his inconsistent form saw manager Jack Ross leave him out for the last few league games.
The 25-year-old was recalled on Tuesday night against promotion rivals Barnsley and he managed to recapture his best form in a revival that could save his season on an individual note.