The call was overturned when replays showed that even though the throw arrived before the runner, Valbuena was able to get his hand on the plate before catcher Travis d'Arnaud could apply the tag.
So, the Cubs took a 1-0 lead as Whiteside was credited with a sacrifice fly.
The next batter was pitcher Travis Wood and he crushed the first offering from Mets starter Jacob deGrom halfway up into the left-field bleachers for a two-run home run and a 3-0 Cubs lead.
John Jackson is a contributor to MLB.com. You can follow him on Twitter @JJacksonSPT. This story was not subject to the approval of Major League Baseball or its clubs.