Diamondbacks first baseman Christian Walker took his hacks during the first day of summer camp, launching a few balls into the empty Chase Field stands and watching them rattle around the unoccupied seats. ''I forgot how much I craved this,'' Walker said. Arizona GM Mike Hazen spent most of the offseason pulling off a series of trades and signings to try and help the Diamondbacks pull closer to the Los Angeles Dodgers, who have won seven straight NL West titles.