Robertson enters just his second season as a closer .
Robertson has always been a strikeout stud and recently curbed Robertson 's walk rate enough to Robertson him three straight seasons of at least a 4.2 K : BB ratio .
Robertson enters just his second season as a closer , but he has always been a strikeout stud and recently curbed his walk rate enough to give him three straight seasons of at least a 4.2 K : BB ratio .