World Cup hosts Russia virtually booked their place in the second round with a 3-1 win over Egypt on Tuesday local time that moved them to top of Group A with six points from two games.
Three goals in the space of 15 minutes early in the second half put the Russians firmly in command before Egypt's Mohamed Salah, who had a subdued game on his return from injury, struck from a penalty, awarded after a video review.
Should Uruguay (3 points) beat Saudi Arabia (0 points) on Wednesday it will ensure the South Americans and the Russians go through to the round of 16 with a game to spare.
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Senegal became the first African team to win a match at the 2018 World Cup on Tuesday when they beat Poland 2-1, helped by two shocking errors in the European side's defence.
Poland defender Thiago Cionek stuck out a leg and deflected Idrissa Gueye's wayward shot into the net in the 37th minute before goalkeeper Wojciech Szczesny rushed unnecessarily out of his area and allowed M'Baye Niang to nip in and score into an empty net on the hour.
Grzegorz Krychowiak headed Poland's goal in the 86th minute.
The win took Senegal top of Group H with three points, along with Japan who also beat Colombia by the same score. Colombia and Poland are both without a point.
Egypt, Morocco, Nigeria and Tunisia all lost their opening games.
