MADRID (AP) — With defending champion Real Madrid away at the Club World Cup in Morocco, this week's Copa del Rey fixture list puts rival challengers, including Barcelona and Atletico Madrid, in focus. Real Madrid and Sevilla played in advance and the champions set the pace by easing past Cornella with a 9-1 victory on aggregate. Barcelona seeks to improve on a 4-0 first-leg win at Huesca when it hosts the third-tier side at the Camp Nou on Tues., while Atletico seeks to build on its 3-0 away win against L'Hospitalet on Thurs. Here are some things to know about this week's round of 16 return leg Copa del Rey matches: ___ MINUS DANI Barcelona will be without Dani Alves' defense-splitting passes that have helped Lionel Messi continue breaking goal-scoring records this season. The club said Sunday that medical tests confirmed Alves had injured a muscle in his right leg and would not play against Huesca. His "availability for future matches" would be determined by the evolution of his injury, a club statement said. ___ STOPPING THE ROT Top tier side Celta Vigo started the season well, losing only one of 11 matches, and upset Barcelona by winning 1-0 at the Camp Nou on Nov.Read more on NewsOK.com