The record-setting home run Mark McGwire hit 20 years ago Saturdaydidn't punch a hole in a Busch Stadium scoreboard or imperil fans in the upper deck the way many of McGwire's 61 previous homers in 1998 had, but it was nonethele s impre sive.No. 62 by the Cardinals slugger, againstthe Cubs' Steve Trachsel, was a low line drive that sped over the left-field wall. Blake Wheeler Jersey Cubs right...