( CNN ) -- They 're hardly a global soccer powerhouse , but Iran 's World Cup run has President Hassan Rouhani tweeting pictures of himself watching a game in a T-shirt . If the Iranians can beat Bosnia convincingly on Wednesday , they might make it to the knockout stage of the World Cup for the first time ever . That 's one of five things we 'll be watching for and talking about Wednesday : . 1 . GROUP F SHOWDOWNS . Trying to get through : . a ) Bosnia-Herzegovina vs. Iran . If Iran can beat Bosnia by more than one goal , and Nigeria loses to Argentina , Iran goes through to the knockout stage as the second-ranking team in Group F. The Middle Easterners have a good record against Bosnia . They 've won four , tied one , and never lost . They 've also put on an impressive display in Brazil this year . They have n't managed to win a match yet , but they held Nigeria to a 0-0 draw and kept Argentina from scoring for 90 minutes . Only a magically curving goal from Lionel Messi in injury time denied the Iranians a draw for the history books . b ) Argentina vs. Nigeria . Sitting at the top of the group , Argentina is guaranteed a place in the round of 16 , while Nigeria will be battling to hang onto second place . If the Africans win , they go top of the group . If they pull off a draw , they get a point and hang onto second place . If they lose , they have to hope it 's close , and that Iran does n't score a big win over Bosnia . 2 . GROUP E MATCHUPS . Free for all : . a ) Honduras vs. Switzerland . Honduras is out of the running , but any of the other teams in Group E could go through to the knockout stage , or , theoretically , be knocked out . Switzerlandwill be aiming for a big win to steal that second-place spot for themselves . The two sides played to a draw the only previous match they played against each other . b ) France vs. Ecuador . France is the safest , with six points and a six-point goal difference . So it would take a tremendous victory by Ecuador to knock the French out of the top spot . But the South Americans will be fighting hard , because they are struggling to hang onto their second place spot in the group . France beat Ecuador the only previous time they faced each other . 3 . LUIS SUAREZ . The fangs come out : . Uruguay 's Luis Suarez is without doubt one of the best football players in the world . He 's also the most controversial . Twice banned from games for biting opponents in the Netherlands and England , no one thought he would be dumb enough to bite someone on the biggest football stage of all . But he might have done just that in Uruguay 's decisive match against Italy . He definitely went face-first into Giorgio Chiellini , and the Italian defender quickly pulled his shirt off his shoulder , claiming he 'd been bitten . Suarez said after the match that he `` just collided with his shoulder . '' World soccer 's governing body FIFA is looking into the incident and could ban Suarez for up to two years . The internet went nuts over the incident , with people comparing Suarez to Jaws and Dracula -- and worse . 4 . COLOMBIA . Group of Death -- but whose ? With three former World Cup champions , Group D was always sure to be the Group of Death , but the victims were hardly the ones anyone expected . Costa Rica was the only team in the group that has never won the tournament , but far from being sacrificial lambs , they turned out to be giant-killers , beating Italy and Uruguay . Tuesday they finished their unbeaten run by holding hapless England to a 0-0 draw . And that was the end of England 's World Cup run . 5 . USA v GERMANY . Bring it : . Team USA is looking ahead to a make-or-break duel against Germany on Thursday , hoping to go through to the knockout stage with a win or a draw . If they lose , Ghana ( or , less likely , Portugal ) could sneak into second place in Group G. The trash talk has already begun at the very highest levels : U.S . Ambassador to the U.N. Samantha Power is ready to put a bet down on the game with her German counterpart . At stake - beer ! .
The team 's most controversial player is in charge again . Germany hopes to get through to the knockout stage for the first time ever . Costa Rica proves to be the team that roared . USA and Germany are already talking on Twitter ahead of Friday 's match .