Barcelona’s Polish forward Robert Lewandowski (R) vies with Mallorca’s Slovakian defender Martin Valjent during the Spanish League football match between RCD Mallorca and FC Barcelona at the Visit Mallorca stadium in Palma de Mallorca on October 1, 2022. (Photo by JAIME REINA / AFP)Robert Lewandowski’s lethal finish sent Barcelona provisionally top of La Liga with a tight 1-0 win at Real Mallorca on Saturday.Marc-Andre ter Stegen kept a fifth consecutive clean sheet in the top-flight and, along with Lewandowski’s brilliantly taken strike in the 20th minute, it was enough to put Barcelona one point clear of Real Madrid, who host Osasuna on Sunday.With a tightened defence and Lewandowski in supreme form up front, Xavi Hernandez’s side are ironing out the creases which caused them so many problems last season.Xavi deployed young left-back Alejandro Balde out of position on the right side of his defence because of injuries to Ronald Araujo, Jules Kounde and Hector Bellerin, and brought Ansu Fati into the starting line-up.It was the 19-year-old’s first start in La Liga since November 2021, after a string of injury problems, and his burst forward contributed to Barcelona’s opening goal.The winger, left out of Luis Enrique’s most recent Spain squad and desperate to impress to try and get the call-up for the World Cup, fed Lewandowski, who cut inside and finished clinically after 20 minutes.The Poland forward, the division’s top goalscorer, netted his ninth league goal with a perfectly-placed, curling finish into the bottom-right corner, through a gap that only he could see.Mallorca should have levelled 15 minutes later but Marc-Andre ter Stegen made a superb save to deny Jaume Costa from close range.Barcelona struggled to