Luis Enrique has warned Spain against complacency heading into the mouth-watering World Cup showdown with Germany, who he feels will "hammer" La Roja if they are overconfident.

The 2010 champions launched their campaign in Qatar with a comprehensive 7-0 rout of Costa Rica on Wednesday, scoring seven goals in a single match at the finals for the first time.

La Roja could secure their last-16 place with a match to spare with victory over Germany, who they steamrollered 6-0 when the sides last met in the Nations League two years ago.

Following their shock defeat by Japan, Hansi Flick's side would subsequently be eliminated at the first hurdle for the second successive finals should Costa Rica fail to beat the Samurai Blue elsewhere in Group E.

Addressing the media at his pre-match press conference, Luis Enrique said: "We tried to manage the [Costa Rica] victory with all normality.

"It was resounding and that gives confidence, but we shouldn't have too much confidence. We face an opponent that will hammer us if we are overconfident.

"It's a great challenge. They've won a World Cup four times. We respect them greatly, they've great players and history is undeniable. 

"Germany are a very good team, so much mobility. If we can control that, great. Otherwise, I have to think about every single element."

He added: "But we are convinced we can beat Germany. We don't want a crazy open match because if they play a high block, we may take too many risks.

"There are many things we have to find out, but we need to follow our principles, which are very similar to theirs."

Meanwhile, forward Dani Olmo, who opened the scoring in the Costa Rica victory, urged his team-mates not to take Germany's defeat by Japan for granted, and focus on their own performance levels.

"Of course, they're under pressure, they need to win after loss against Japan," he said. "But we know they are one of the best in the world, and you cannot put them down after one game.

"It's a final for them, they need to win to get to next round, but we focus on our journey because we are through if we win.

"Hansi a great coach, he wants to dominate the game, he showed this in Bayern. 

"Most of their players play for Bayern, so we know the style, and they know us well, so we have to focus on our game."

Coach Graham Arnold wants his Australia players to swiftly forget their 1-0 World Cup win over Tunisia and turn their attention to securing qualification for the knockout stage against Denmark.

Mitchell Duke scored the only goal, glancing home Craig Goodwin's deflected cross in the 23rd minute, before the Socceroos withstood some concerted Tunisia pressure to secure their first win at a World Cup in 12 years and first clean sheet since 1974.

The win moves Australia on to three points and with renewed hope of advancing out of Group D. Next up on Wednesday is a clash with the Danes and that has already become the focus of Arnold's attention.

Asked about his approach to that game, he said: "We've got to see what the result is tonight [between France and Denmark] but nothing will change, we’ll focus on ourselves and getting ourselves right.

"I am very proud but we've achieved nothing. We can talk after about one win and that it hasn't been done for 12 years and all that stuff.

"We are here to go as far as we can go. I don't want the players sitting up all night looking at social media, we need to recover well and get ready for Denmark."

The goal was a special moment for Duke and he celebrated by making a J sign with his fingers to son Jaxson, who was watching on from the stands. Television images showed his son replying in kind.

Duke said: "I spoke to my son and told him I was going to score – you have to have that belief that you are going to score in every match. I told my son that I was going to share that moment with him."

The 31-year-old, who plays in Japan with second division side Fagiano Okayama, was reunited with Jaxson and daughter Chloe at the start of November and admitted it was difficult being apart from his family.

"Definitely, when the final whistle went and I was interviewed by TV, I was trying to hold back the tears," he added. "I have been on my own a lot over the last couple of years and there has been a lot of sacrifice. It's the best feeling in the world."

Tunisia must now beat defending champions France on Wednesday and hope other results go their way if they are to go through.

Coach Jalel Kadri bemoaned his side's lack of cutting edge but insisted all was not lost.

He said: "During the first half, we did not perform the way we wanted to, Australia led us into playing a style we did not like.

"They dominated the game, created one chance and scored and unfortunately we could not equalise. We changed tactics two or three times in the second half and created four or five chances but we were not clinical enough. They were very efficient in converting their chance.

"The World Cup has a surprise for everyone, even the larger teams have been beaten by the underdogs. We were not expecting to lose [to Australia] but we have one game to go and we will play our hearts out."

Roberto Martinez will expect a vast improvement from his Belgium side when they go in search of a record-breaking World Cup win over Morocco on Sunday.

The Red Devils were fortunate to beat Canada 1-0 in their first match of the tournament on Wednesday courtesy of a clinical finish from Michy Batshuayi.

Canada were the better side and Alphonso Davies had a penalty saved by Thibaut Courtois before Batshuayi secured all three points.

Belgium looked shaky at the back and got away with a lacklustre performance, Canada failing to find the back of the net with 22 attempts in the opening match of only their second World Cup.

But if Belgium beat Morocco, they will become the first team in World Cup history to win nine consecutive group games.

Morocco held Croatia to a goalless draw in their first Group F match and are plotting to spring a surprise at Al Thumama Stadium this weekend.

The Atlas Lions have injury concerns over Achraf Hakimi and Noussair Mazraoui for the encounter in Doha.

Belgium striker Romelu Lukaku has been back in training as he works his way back from a thigh injury, with head coach Martinez having stated no timeframe has been set on when he might return

Kevin De Bruyne says even if the Red Devils' all-time record goalscorer is only able to take his place on the bench, that would give the squad a lift.

The inspirational midfielder said: "I don’t know how he is, he has been training with us and also apart these days.

"I must admit that he is a player who helps the team a lot, you can feel his presence on the pitch. 

"I don't even know if he will be there against Morocco, but if he were to start from the bench he would be an extra weapon in the game."

Belgium are unbeaten in their four World Cup meetings with African teams and came out on top when the two nations met at the 1994 showpiece, Marc Degryse scoring the only goal of the game.

PLAYERS TO WATCH

Belgium - Michy Batshuayi

In the absence of Lukaku, Batshuayi stepped up to get Belgium off to a winning start as they rode their luck in midweek.

He had five of Belgium’s nine shots and was the only player to register an attempt on goal for the Red Devils before being replaced in the 78th minute.

If Belgium can exert more control on the game, Batshuayi is capable of rewarding them as he should be full of confidence after his decisive strike.

Morocco - Hakim Ziyech

A lack of goals has been a big issue for Morocco in World Cup matches, with the stalemate versus Croatia being the ninth time in 17 games they have failed to find the back of the net.

Hakim Ziyech is one of the players who is capable of getting them firing in Qatar, where he had two shots and created as many chances against Croatia.

The Chelsea winger has shown he can has the quality to produce moments of magic with his wand of a left foot, which Belgium will be wary of.

PREDICTION

Belgium will be expected to make it two wins out of two despite an uninspiring start.

According to Stats Perform's AI model, Martinez's men have a 48.7 per cent chance of securing a record-breaking victory.

Morocco will have seen weaknesses to exploit in that Belgium display against the Canadians and they are rated as having a 26 per cent chance of pulling off a shock victory, with the draw at 25.3 per cent.

A first-half header from Mitch Duke was enough to see off Tunisia and ignite Australia's hopes of progressing to the World Cup knockout stages in a 1-0 victory.

Duke converted Craig Goodwin's left-wing cross in the 23rd minute with the Socceroos having to withstand some late pressure to secure a win that means they head into their final Group D clash with Denmark with all to play for.

Tunisia have a solitary point from their two games and will have to beat defending champions France on Wednesday and hope other results go their way.

Australia shaded a frantic opening but could not profit from a series of crosses into the Tunisia box.

Delivering the ball from wide areas was clearly a key part of the Australia strategy and it paid dividends midway through the first half. Duke started the move with a deft touch in midfield before racing into the box to cleverly glance Goodwin’s deflected cross past Tunisia goalkeeper Aymen Dahmen.

Tunisia grew as an attacking force as the first half progressed and could have levelled twice before the break.

After 41 minutes, robust play from Issam Jebali saw him pick out Mohamed Drager at the far post only for defender Harry Souttar to race across to block his goalbound shot.

The tireless Jebali then turned up on the right but his low centre was fired wide by captain Youssef Msakni.

Tunisia dominated possession in the second half but their desperation to find an equaliser almost saw them undone again after 71 minutes - substitute Jamie Maclaren escaping down the left before delivering a low cross that was inches in front of the sliding Mathew Leckie.

A second goal was not required in the end as Australia's resolute backline - in which Souttar was outstanding - did enough to keep Tunisia out and register just the Socceroos' second clean sheet in 18 World Cup matches.