By Tom Gott Robert Lewandowski struck a 97th-minute penalty to steer Barcelona to a 2-1 win over Celta Vigo on Saturday. The Poland international, who had opened the scoring shortly before half-time, actually missed the effort first time around but was awarded a retake as Vicente Guaita left his line early, and Lewandowski made no mistake second time around. Both sides had chances to win the game but it was Barcelona who were celebrating when the dust settled, with the Blaugrana’s title hopes still hanging on by a thread. Vitor Roque, starting out on the left wing, linked up well with Lamine Y…