In , Clark and the Giants defeated the Chicago Cubs in the National League Championship Series (NLCS). In Game 1, Clark had already hit a solo home run. Prior to a subsequent at-bat, Cubs' catcher Rick Wrona went to the mound to discuss with Greg Maddux how to pitch to Clark. From the on-deck circle, Clark watched the conversation and read Greg Maddux's lips saying "fastball high, inside." The first pitch was a fastball high and inside which Clark sent into the street beyond right field for a grand slam. Afterwards, pitchers began to cover their mouths with their gloves when having conversations on the pitcher's mound. (The "Chicago Tribune"'s front page the next day paid tribute to his performance with a headline of "Clark's night on Addison.")