On August 7, 2006 — The Diamondbacks trade a pair of pitching prospects, Matt Chico and Garrett Mock, to the Nationals for veteran right-hander Livan Hernandez (9-8, 5.34). Washington had put the 31 year-old Cuban on waivers with the hopes of making a deal with any team, but Arizona blocked that option as it tries to stay in the hunt in the NL West.

Source:
Baseball Reference August 7
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game