Analysis: Four things we learned in Spain's matchday 4

MADRID, Sept. 2 (Xinhua) -- La Liga goes into the international break after the fourth round of games of the season leaving FC Barcelona top of the table, while Kylian Mbappe finally scored his first league goals for Real Madrid. Here are some things we have learned this weekend in Spain.

1. Great start for Barcelona shouldn't hide problems at the club

FC Barcelona enjoyed an easy 7-0 win at home to Valla