Two of the best players on the planet go head-to-head when Lionel Messi of Argentina and Robert Lewandowski of Poland meet with World Cup implications in what is likely Messi's final attempt to win the tournament.

That match is part of an intense Wednesday at the World Cup: Mexico could be eliminated from the group stage for the first time since 1978 and Saudi Arabi has a chance to advance after its opening-game upset over Argentina.

But the spectacle will be at Stadium 974 in Doha, where Messi and Lewandowski square off.

Poland leads the group and a draw is enough to advance to the round of 16. But after the shocking loss to Saudi Arabia in its opening match, Argentina is only guaranteed to advance with a victory. A draw could get Argentina into the next round depending on the other result.

A loss? Well, that would mean elimination and humiliation. Messi is playing in his record-tying fifth World Cup and, at 35 years old, he's unlikely to play in a sixth.

He knows it, too, and the devoted Argentina fanbase shed tears after Messi scored the crucial second-half goal to seal a 2-0 win over Mexico last week. Argentina has not been eliminated from the group stage since 2002.

Read more: Goalless Mexico on brink of World Cup elimination

“I think when the groups were drawn and we were put together, the whole world has been waiting for this match," Poland coach Czeslaw Michniewicz said.

Poland is trying to advance out of the group stage for the first time since 1986, and the Poles last went unbeaten in all three first round games in 1982 en route to the semifinals. Lewandowski failed to convert a penalty in a 0-0 draw with Mexico, but he scored his first career World Cup goal in a 2-0 win over Saudi Arabia.

Messi and Lewandowski have never before played each other at the international level, but have gone head-to-head three times at the club level in the Champions League. Messi scored twice for Barcelona in a 2015 win and Lewandowski scored once each for Bayern Munich in victories over Barcelona in 2015 and 2020.

Michniewicz said the match is much bigger than two players and it will be team effort, not Messi or Lewandowski, that decides the game.

“It’s not Messi versus Lewandowski. It’s not tennis, it’s not 1-on-1. They are not serving to each other," the Poland coach said. “Robert needs his teammates, like Leo does. They rely on their teammates, they can’t do this alone, although these individual players can do a lot themselves.”

MEXICO-SAUDI ARABIA

Mexico came to the World Cup with goalkeeper Guillermo Ochoa desperate to advance past the round of 16 and play in an elusive “quinto partido” — a fifth game.

If Mexico doesn't make something happen against Saudi Arabia, there might not even be a “cuarto partido.”

El Tri hasn't advanced to the quarterfinals since Mexico hosted the 1986 tournament, but the team is now on the verge of elimination in group play. A loss to Saudi Arabia would end Mexico’s bid for an eighth straight trip to the World Cup’s knockout rounds.

The last time Mexico played at soccer’s biggest tournament and didn’t advance out of its group was in 1978.

But Mexico needs to do more than just win. Even with a victory, Mexico needs Poland to beat Argentina, and maybe even goal difference will determine Mexico's fate.

Read more: FIFA World Cup 2022: Messi leads Argentina to 2-0 win over Mexico

One problem: Mexico has yet to score any goals in Qatar. El Tri hasn’t scored in 384 straight minutes at the World Cup, dating back to their second group match at the 2018 tournament in Russia.

“In the next game we have no more chances,” Mexico forward Henry Martin said. “We have to score the goals that we can, and not worry what happens in the other game.”

Saudi Arabia pulled off one of the tournament’s biggest upsets ever when it beat Argentina 2-1 in its opener. The team reached the knockout stage in 1994 in its World Cup debut but hasn’t made it past the group stage since.

Saudi Arabia can advance with a win. A draw would also be enough if Poland beats Argentina.

“We will play to the last second of this tournament and we will not give up,” Saudi Arabia coach Herve Renard said.