In his celebrated 2006 season, Carlos Silva issued seven unintentional walks and also hit three batters for ten net walks allowed of 749 batters faced. That's 1.34% of hitters.
Another walkless performance from Cliff Lee last night puts him at four unintentional walks and zero hit batters of 305 batters faced. That's 1.31% of hitters.
Cliff Lee also strikes hitters out, works fast, smiles and isn't Carlos Silva. He also isn't going to be a Mariner for as long as Silva was.