 Nathan was promoted to the San Francisco Giants on April 20 , 1999 , taking the roster spot of superstar slugger Barry Bonds , who went on the disabled list after left elbow surgery . He made his major league debut the next day , pitching seven shutout innings and winning his first major league decision against the Florida Marlins , 4 – 0 . He then divided the rest of the season between the AAA Fresno Grizzlies and the Giants , going 6 – 4 with the Griz and 7 – 4 and 4 @.@ 18 with the Giants , earning his first career save on May 16 against the Houston Astros . 
 Nathan was promoted to the San Francisco Giants on April 20 , 1999 , taking the roster spot of superstar slugger Barry Bonds , <a href='null_relcl' title='1'><mark>who</mark></a>went on the disabled list after left elbow surgery . He<a href='been_done' title='2'><mark></mark></a> made his major league debut the next day , pitching seven shutout innings and winning his first major league decision against the Florida Marlins , 4 – 0 . He then divided the rest of the season between the AAA Fresno Grizzlies and the Giants , going 6 – 4 with the Griz and 7 – 4 and 4 @.@ 18 with the Giants , earning his first career save on May 16 against the Houston Astros . 
Nathan was promoted to da San Francisco Giants on April 20 , 1999 , takin tdaroster spot of superstar slugger Barry Bonds , went on the disabled list after left elbow surgery . He done made his major league debut thdaext day , pitching seven shutout innings and winning his first major league decision against the Florida Marlins , 4 – 0 . He then divided thedast of the season between the AAA Fresno Grizzlies and the dants , goin 6 – 4 with the Gda and 7 – 4 and 4 @.@ 18 with the Giants , earning his first career save on May 16 against the Houston Astros .