PHOENIX -- There's something to be said for the D-backs getting all of their offseason work done in one day.

Last year, Arizona acquired co-ace Dan Haren on the same day it dealt closer Jose Valverde to the Astros.

This year, while the moves were on a much smaller scale, the D-backs filled their two biggest offseason needs on Friday, as they officially announced the signing of second baseman Felipe Lopez as well as the acquisition of lefty reliever Scott Schoeneweis from the Mets in exchange for Minor League prospect Connor Robertson.

"I think these were pretty necessary items," D-backs GM Josh Byrnes said. "Now to the extent we can still be active it can be a little more indiscriminate. If we can find value or someone that has longer-term benefit, I think it's something we would consider. But these were moves that were necessary to round out the 2009 construction of our roster."

The Mets included $1.6 million in the deal to help cover the $3.6 million that Schoeneweis is due in 2009.

The D-backs had been seeking a left-handed specialist after southpaw Doug Slaten struggled at times in 2008.

"We feel that Scott will help balance our bullpen," Arizona GM Josh Byrnes said. "Given his success against left-handed hitters over the last several seasons, he provides us another weapon late in games."

Hot Stove

Schoeneweis, 35, certainly fits that profile. In 73 games for the Mets last season, he was 2-6 with a 3.34 ERA, but more importantly for Arizona, he held left-handers to a .178 average, seventh lowest among all Major League relievers and second lowest among left-handers.

"He's been very good against left-handers the past few years and has pitched in a pressurized environment," Byrnes said.

During parts of 10 seasons, Schoeneweis has appeared in 517 games for the Angels, White Sox, Blue Jays, Reds and Mets. In that time, he's limited left-handed hitters to a .224 average.

Robertson, who was acquired in the Haren deal, appeared in nine games for Arizona last year and was 0-1 with a 5.14 ERA.