Bob Melvin went 337-340 managing the Arizona Diamondbacks and is 498-503 overall. He led the 2007 Diamondbacks to the best record in the National League despite fielding a team that scored 20 fewer runs than it allowed. That club swept the Chicago Cubs in the NLDS, and Melvin was later named as the National League's Manager of the Year.
Things began to sour for Melvin after his club put up a 20-8 April record last year. Since then, the D-backs have gone 74-89, although much of this year's struggles can be attributed to injuries to the team's best pitcher (Brandon Webb) and position player (Stephen Drew).
"I'm still questioning the focus out there. I mean, these guys are much better than that," D-backs president Derrick Hall said on KTAR 620 AM, the team's flagship station, shortly before news of Melvin's dismissal was leaked. "We are underperforming and so we are evaluating everything."
No replacement for Melvin has been named, but KTAR reports that third base coach Chip Hale is not being considered as a candidate. Bob Brenley, who managed the Diamondbacks' lone World Championship squad in 2001, was actively seeking employment as a manager this winter, most notably for the Milwaukee Brewers' managerial vacancy.