Lionel Messi and Luis Suarez scored their 15th league goals of the season as Barcelona stayed on the heels of La Liga leaders Real Madrid by winning 4-0 at Eibar on Sunday although the win was marred by an injury to key midfielder Sergio Busquets. Substitute Denis Suarez scored his first goal for Barca, firing the visitors into the lead from the edge of the area in the 31st minute after replacing Busquets, who had been carried off on a stretcher with strained ankle ligaments following a crunching tackle by Eibar’s Gonzalo Escalante.