Keeping Carlos Marmol a tough call for Cubs’ bullpen

ST. LOUIS — If there’s an upside to Carlos Marmol’s ugly season, it might be that the Cubs haven’t particularly needed a closer the way the season has gone. But if they plan to be competitive next season, they’ll need a new Marmol. Or a new closer. His latest command meltdown Saturday — punctuated by a bases-loaded wild pitch that ended a 2-1 loss to the St. Louis Cardinals — put him in sole possession of the major-league lead in blown saves with 10. His .773 save percentage (34-for-44) is the worst in the ­National League. “I don’t like the …