Expected Crowd Turnout: The Poland vs Senegal encounter is expected to be a house-full affair with a total crowd turnout of 43,700.
The seeded team in the group, Poland had been hoping to inflict a fifth straight defeat on Russian Federation 2018's African contingent but they did not account for their opponents' tactical discipline or good fortune.
But while the Senegal first was unlucky for Poland, they were architects of their own downfall for the decisive second, handing Niang his first global goal on the hour mark.
Saliou Ciss has been ruled out of the world cup.
The Senegalese defence led by Kalidou Koulibaly did a yeo man's job in silencing Robert Lewandowski. Poland returned for the first time since 2006.
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Playing in their first match on this stage since their memorable run to the quarter-finals in 2002, Senegal triumphed thanks to two goals that owed much to Polish generosity: a Thiago Cionek own goal and a disgusting mix-up to let in Mbaye Niang for a tap-in. Cionek, near the penalty spot, lifted his right leg and deflected the ball past Szczesny's other side for the fourth own-goal of the tournament.
With another Polish move breaking down, Krychowiak, who did not cover himself in glory while on loan at West Brom last season, looped a back-pass in the general direction of Southampton's Jan Bednarek, just on as a substitute.
Then came an unusual goal.
4 - Senegal are one of only three sides in World Cup history (including East Germany and Wales, both three) who are unbeaten in group stage matches, having now played four without a single defeat. An even more concerning statistic is the fact he and second striker Arek Milik only exchanged a single pass before the latter was substituted in the 73rd minute.
Kamil Glik, passed fit despite pre-match fitness doubts, should have got Poland back in the game but he slotted a ideal Piszczek cross wide at the near post.
Few would have predicted the results in the group, which put both favorites at the bottom. He was replaced by Bednarek at the start of the second half.