PHOENIX — The Los Angeles Angels made a move to keep up with the Texas Rangers in the AL West by trading for infielder Alberto Callaspo last week.

The next step was to add a quality pitcher, one who could counter the Rangers acquiring former Cy Young winner Cliff Lee.

A three-time All-Star who's one of the most durable pitchers in baseball should do the trick.

The Angels bolstered their already-solid rotation by acquiring right-hander Dan Haren from the Diamondbacks on Sunday in a deal that sent left-hander Joe Saunders and three other players to Arizona.

The last-place Diamondbacks also get right-hander Rafael Rodriguez, left-hander Patrick Corbin and a player to be named in the deal.

"We really felt good about our starting five moving forward with what we had but this is a huge opportunity for us to upgrade not only now but for the next several years," Angels manager Mike Scioscia said. "This guy still has his stuff and it gives us a deeper front end of our rotation."