 Brock hit only .217 in 54 games with the Cubs' AA affiliate at West Tennessee that season, but nevertheless made the Cubs' major league roster in spring training of 2000.He made his major league debut on March 29, 2000, appearing as a left fielder in the Cubs' Opening Day game against the New York Mets in the Tokyo Dome in Japan.He faced Rich Rodriguez in his first major league at bat and singled to right field.