An injury to Cristiano Ronaldo exacerbated Portugal's frustrating start to its European Championship title defense.

Things couldn't be going much better for free-scoring England and France.

Ronaldo hobbled off in the first half with an apparent right hamstring injury in Portugal's 1-1 draw with Serbia in Lisbon, which came three days after the titleholder's 0-0 draw with Ukraine also at home.

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