Robert Lewandowski s second-half strike helped Barcelona beat Alaves 1-0 on Sunday to cut the gap on La Liga leaders Real Madrid down to four points. The Catalans, third, capitalised with a narrow victory after the champions slipped up across town at Espanyol on Saturday. Barcelona trail second place Atletico by three points before the Rojiblancos face Real Madrid in a tasty derby clash next weekend, which could allow Hansi Flicks side to make up more ground. Lewandowski netted from a Lamine Ya