The World Cup is still wrapping up group play but a handful of interesting knockout stage matchups are on the board and soccer fans are searching for value in the World Cup odds.

The Round of 16 gets underway on June 30 and July 1 and here's a quick betting breakdown of those four matchups and their best sports betting sites odds.

France (-150) vs. Argentina (+110)
Neither team impressed in the group stage but it was Argentina that soured soccer bettors the most. They opened the World Cup with a draw versus Iceland and then suffered a stunning 3-0 defeat to Croatia in the second Group D game. Argentina finally showed up in the finale versus Nigeria, pulling out a 2-1 victory and getting its first goal of the tournament from superstar Lionel Messi.

France, on the other hand, won its first two games – one-goal victories over Australia and Peru – before a deciding draw against a quality Denmark side. Much like Argentina, the French didn’t live up to their lofty offensive standards, scoring just three goals in three games.

Perhaps the best advice for this match is to forget what you saw in group play when it comes to these teams. Argentina is still one of the most talented squads and if Messi can find momentum from his goal in the final group play: watch out. The pressure is now off Argentina and chemistry is finally starting to bleed through on the pitch.

Uruguay (-125) vs. Portugal (-106)
The odds for this matchup would have looked very different had Portugal not conceded an injury time goal on a penalty kick – and nearly another last-minute marker – in a 1-1 draw with Iran in their final Group B contest. Portugal exploded for three goals versus Spain in the opener but have since stumbled on the attacking end, with a single goal in each of their final two games.

Uruguay showed it was the class of Group A, bring a red-hot host Russia team back to earth with an extremely impressive 3-0 victory in the final group meeting. They tallied a 5-0 goals for/against record in Group A play and superstar Luis Suarez is stepping up big on the world stage again.

This game has late goal, extra time or penalty kicks all over it. The three-way market is offering a 90-minute draw at +200, decided in extra time at +500, and decided in penalties at +400. This match will hinge on the play of Suarez and Portugal soccer god Crisitano Ronaldo.

Spain (-800) vs. Russia (+250)
The host country looked unstoppable in its opening two Group A games, blasting Saudi Arabia 5-0 and taking a 3-1 victory over Egypt. Then, Uruguay put the Russians in their place, leaving many to question the quality of this squad. Paranoid soccer fans could be banking on some friendly officiating if this game is close in the final minutes.

Spain was another soccer superpower that failed to impress. It couldn’t shake Portugal in a 3-3 draw, was listless in a 1-0 win over Iran, and then settled for a 2-2 draw with Morocco. But let’s not forget this team sacked manager Julen Lopetegui right before the World Cup, so the group stage was a learning process.

Oddsmakers aren’t counting out Spain, despite a poor group effort, but if you think Russia has some home-field magic, perhaps bet a 90-minute draw at +290 and a loss in extra time (+600) or penalties (+600). The Over 2.5 goals (+115) could also hold value, as Spain’s defending has been lacking.

Croatia (-118) vs. Denmark (+400)
Denmark could be the sleeper of the knockout stage. This team went 6-2-2 with 20 goals and eight against in qualifying, then went toe-to-toe with France in the final Group C contest after a win over Peru and a draw with Australia.

Croatia went 3-0 in Group D play, beating Nigeria and Argentina handedly before edging Iceland 2-1 with a goal in the 90th minute. They run into a tough matchup with Denmark, which runs as one of the bigger teams in the World Cup and can match that Croatian tenacity.

If you think Croatia has peaked too soon, and are buying into Denmark’s consistent results, the 4/1 flyer on the underdog Danes is worth a wager. The winner of this game goes on to play the Spain/Russia victor.