"I knew that with guys on base, if I don't make that play, they're scoring," Wong said. "As soon as I saw the ball hit, I knew I was going to do everything I could to catch that ball, and luckily I did."
Cardinals pitcher Lance Lynn needed the boost after his errant pickoff attempt earlier in the inning led to San Diego's run.
"That was one heck of a play," Lynn said. "He covered a lot of ground there. I jammed [Alonso] pretty good, and for [Wong] to make that play was huge at the time, because they're probably looking at a 2-0 lead right there if he doesn't make the play."
A crowd of 42,764 roared in approval as Wong rolled over and popped up with the ball in his glove.
"Saves a run, kept the lead for us," manager Mike Matheny said. "Terrific, athletic play, and that's something he needs to take out of this game."
David Cobb is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.