Forget Fernando Tatis ... the best play of the Padres game Wednesday was made by a fan in the stands -- with a woman making a ridiculous catch on a foul ball all while holding her baby!!!
The wild moment went down in the the sixth inning of the Padres' game against the Cubs in San Diego ... when Chicago pinch hitter Jake Marisnick lifted a foul ball into the seats.
As the cowhide clanked around the stadium ... it took a wicked hop into the lower deck -- where SuperMom made an absurd play on the baseball!