When Lee Smith called it a career after the 1997 season, there was no closer more fruitful in baseball history. He held the record in career saves, with 478. He acquired at least 30 saves 10 times and 40 saves three times, leading the NL four times (and the Majors twice). More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.