The Giants are shaking up their struggling offense. The team announced Wednesday that first baseman LaMonte Wade Jr. and backup catcher Sam Huff have been designated for assignment. Veteran first baseman Dominic Smith, who recently opted out of a minor league deal with the Yankees, has been signed to a one-year, major league contract. San Francisco also selected the contracts of outfielder Daniel Johnson and catcher Andrew Knizner from Triple-A and optioned infielder Christian Koss.

More to come.