Marmol's save in the Cubs' 5-3 win over the Mets was his fifth of the season. The right-hander lost the job earlier this year, and is 3-for-3 in save opportunities this month.
"It's the one spot where you stand on the mound and you're the only guy who can close the game out," Cubs manager Dale Sveum said. "Not everybody, as we well know, can get those final three outs of the game. They're the most difficult three outs there are.
"Only certain people can do it and some people have longevity doing it, and they usually go to the Hall of Fame and the rest of them are hit or miss, year to year," Sveum said. "It's a nice accomplishment to have 100 saves."
Smith owns the Cubs record with 180 saves, while Sutter totaled 133 and Myers had 112.