Croatia started their World Cup campaign with a goalless draw against a well-drilled Morocco.
There were only four players from the final defeat by France who started this game and they lacked an attacking spark.
There were clear-cut opportunities that were not created by Morocco.
Canada and Belgium are in the same group.
Croatia, who are 12th in the world rankings, dominated possession as expected, but they were unable to break down a team that has lost two of their past 40 games.
At the end of the first half, the best chance of a match that had only two shots on target came when a left-wing cross was diverted towards goal by Vlasic, but he was denied by the right leg of Bou.
Noussair Mazraoui followed in a shot that was saved by the keeper.
The Croatia keeper dealt with the 35-yard strike by the Paris St-Germain full-back.
The game was mostly played in the middle third of the pitch, with both sides potentially wary of losing and damaging their chances of progressing to the knockout stages from a group that also includes Belgium and Canada.
After Poland and Mexico played on Tuesday, the third goalless draw of the World Cup took place. In Russia, there were only one in the whole tournament.
Croatia will play Canada in their next match on Sunday, while Canada and Belgium will play on the same day.
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