In the first four seasons of Jose Valverde’s Major League career, he seemingly was fighting for the closers role with the Diamondbacks.  When he would win it, injuries would take it away or a slump might have cost him the role.  In that time frame the Dominican reliever who would become known as “Papa Grande” would accumulate 56 Saves.  That wasn’t bad, but it was in 2007 where he was the undisputed closer of the team where he did more than enough to land him on this list.

In 2001, Byung hyun Kim made history as the first Korean born player to win a World Series and though his performance in the Fall Classic was poor (0-1 with a 13.50 ERA), he was not a bystander in getting the team there.  Kim took over as the Diamondbacks closer that year and in 2002 he had his best regular season with 36 Saves (eight overall in the NL), a 2.04 ERA and his first and only trip to the All Star Game.  Kim would record 70 Saves for Arizona and will always be remembered in the desert for that submarine delivery.

Ian Kennedy had an interesting up and down career in the world of Major League Baseball but by far and wide the best season he ever had by far was in 2011.  That year Kennedy went 21 and 4 with a 2.88 Earned Run Average while finishing fourth in Cy Young voting.  He would secure 15 Wins the next year, but was traded during the following season to San Diego.

Kennedy returned in 2022, though had an awful year with a negative bWAR, and an ERA over five.  He left again, this time for Texas.

His record with Arizona was 48-34 with 661 Strikeouts.

In terms of baseball history, Jay Bell is probably better known for his time with the Pittsburgh Pirates where he was an All Star in 1993, but it was in Arizona (where he was an All-Star in 1999) where he would win the World Series.