Lionel Messi of FC Barcelona celebrates with his teammate Jordi Alba of FC Barcelona after scoring their opening goal during the Copa del Rey Round of 16 first leg match between Athletic Club and FC Barcelona at San Mames Stadium on January 5, 2017 in Bilbao, Spain The defending champs have it all to do in the second leg which takes place next Wednesday at the Nou Camp. King’s Cup holders Barcelona have a fight on their hands if they are to remain in the competition after losing a fiery first leg of their last-16 tie at Athletic Club 2-1 on Thursday despite playing the final 10 minutes with a two-man advantage.