Fresh off the back of an impressive 2-1 win over Argentina, Herve Renard's men set out to confirm their place in the knockout stages of football's biggest tournament.
On the other hand, Poland had to make do with a point in their curtain-raiser against Mexico and anything less than a victory this weekend could leave them on the brink of elimination.
Here, Sports Mole looks at how the squads of Poland and Saudi Arabia compare against each other ahead of the contest.
POLAND
Most valuable player:
Robert Lewandowski (£38.7m)
Overall squad value:
£219.9m
Most capped player:
Robert Lewandowski (135)
Leading goalscorer:
Robert Lewandowski (76)
Total caps:
911
Total goals:
157
Oldest player:
Artur Jedrzejczyk (35)
Youngest player:
Jakub Kaminski (20)
Average age:
27
SQUAD IN FULL
Goalkeepers: Wojciech Szczesny (Juventus), Lukasz Skorupski (Bologna), Bartlomiej Dragowski (Spezia)
Defenders: Kamil Glik (Benevento), Bartosz Bereszynski (Sampdoria), Jan Bednarek (Aston Villa), Matty Cash (Aston Villa), Robert Gumny (Augsburg), Artur Jedrzejczyk (Legia Warsaw), Jakub Kiwior (Spezia), Mateusz Wieteska (Clermont), Nicola Zalewski (Roma)
Midfielders: Piotr Zielinski (Napoli) Kamil Grosicki (Pogon Szczecin), Grzegorz Krychowiak (Al-Shabab), Damian Szymanski (AEK) Sebastian Szymanski (Feyenoord), Przemyslaw Frankowski (Lens), Krystian Bielik (Birmingham City), Jakub Kaminski (Wolfsburg), Michal Skoras (Lech Poznan), Szymon Zurkowski (Fiorentina)
Forwards: Robert Lewandowski (Barcelona), Arkadiusz Milik (Juventus), Krzysztof Piatek (Salernitana), Karol Swiderski (Charlotte)
SAUDI ARABIA
Most valuable player:
Sultan Al-Ghannam (£2.2m)
Overall squad value:
£21.8m
Most capped player:
Yasser Al-Shahrani (73)
Leading goalscorer:
Salem Al-Dawsari (18)
Total caps:
774
Total goals:
66
Oldest player:
Salman Al-Faraj (33)
Youngest player:
Haitham Asiri (21)
Average age:
27.4
SQUAD IN FULL
Goalkeepers: Mohamed Al-Owais (Al-Hilal), Nawaf Al-Aqidi (Al-Nassr), Mohamed Al-Yami (Al-Ahly)
Defenders: Yasser Al-Shahrani (Al-Hilal), Ali Al-Bulaihi (Al-Hilal), Abdulelah Al-Amri (Al-Nassr), Abdullah Madu (Al-Nassr), Hassan Tambakti (Al-Shabab), Sultan Al-Ghanam (Al-Nassr), Mohammed Al-Breik (Al-Hilal), Saud Abdulhamid (Al-Hilal)
Midfielders: Salman Al-Faraj (Al-Hilal), Riyadh Sharahili (Abha), Ali Al-Hassan (Al-Nassr), Mohamed Kanno (Al-Hilal), Abdulelah Al-Malki (Al-Hilal), Sami Al-Najei (Al-Nassr), Abdullah Otayf (Al-Hilal), Nasser Al-Dawsari (Al-Hilal), Abdulrahman Al-Aboud (Ittihad), Salem Al-Dawsari (Al-Hilal), Hattan Bahebri (Al-Shabab)
Forwards: Fahad Al-Muwallad (Al-Shabab), Haitham Asiri (Al-Ahly), Saleh Al-Shehri (Al-Hilal) Firas Al-Buraikan (Al-Fateh)
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How Saudi Arabia could line up against Poland