5 things to know about Portugal vs. Sweden playoff

Cristiano Ronaldo v Zlatan Ibrahimovic: Portugal against Sweden in World Cup play-off is a battle of the titans

Portugal's Cristiano Ronaldo and Sweden's Zlatan Ibrahimovic are two of the game's top showmen, and prolific scorers, with the kind of talent that can light up stadiums. And both are in top form — they each bagged a hat trick for their clubs last weekend.

Ronaldo's third hat trick of the Spanish season for Real Madrid made him the top scorer in La Liga with 16 goals in 13 rounds. He has added another eight in four Champions League games.

The 28-year-old winger, who was crowned FIFA world player of the year in 2008, is Portugal's second-highest scorer after Eusebio, with 43 strikes in 107 appearances.

Swedish defender Mikael Lustig has the job of marking Ronaldo — and says he'll need some help, because "support is the secret in a game like this."

Ibrahimovic is Sweden's second all-time scorer, with 46 goals. He has racked up 15 goals in 16 games for Paris Saint-Germain this season, including seven in the Champions League.

The 32-year-old striker was the French league's top scorer last season and can swing a game in his team's favor. A year ago, he scored all of Sweden's goals in a 4-2 win over England, with his late overhead kick counting as one of the sport's greatest goals.

"We can stop him," Portuguese center-back Bruno Alves said, "but it means stopping the whole Sweden team because if he doesn't get the ball he can't do much."