The 2004 Arizona Diamondbacks looked to improve on their 84–78 record from 2003. The Diamondsbacks hoped to contend for a postseason berth in what was a weaker National League West than in years past, but finished the season with a record of 51–111, in last place in the division and the worst record by any National League team since the 1965 Mets won one fewer game. The one highlight of a disastrous season was when Randy Johnson pitched a perfect game on May 18, 2004.