DONETSK (Reuters) - Holders Spain will be given their sternest Euro 2012 test yet against Iberian rivals Portugal and their in-form forward Cristiano Ronaldo in the first semi-final later on Wednesday.

All eyes will be on Spain coach Vincente del Bosque to see if he continues his policy of not starting with a striker.

The scampering Ronaldo is set to be marked by Real Madrid team mate Alvaro Arbeloa in Donetsk.

Spain vs. Portugal kicks off at 2.45 p.m. EST and can be watched live on ESPN, or online through live streaming on ESPN3 by clicking HERE.

Germany and Italy will meanwhile be continuing their preparations for Thursday's second semi-final in Warsaw.

The final is in Kiev on Sunday.

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Euro 2012