Analysis: Four things we learn in Spain's Matchday 21

MADRID, Jan. 27 (Xinhua) -- Real Madrid extended their lead at the top of La Liga to four points over Atletico Madrid, while Barcelona showed they haven't given up on the title. Here are some takeaways from the weekend in Spain:

1. Mbappe on fire without Vinicius

Although nobody expected anything other than an away win for Real Madrid at bottom side Valladolid on Saturday, Kylian Mbappe used the match to