Mittelstaedt put Wisconsin (38-32) in front in the top of the fifth inning. He tripled to right-center with two outs to drive in the first run of the game.
Cedar Rapids (32-38) came back in the bottom of the fifth on a two-out RBI single by Rolando Gomez.
Chris Dennis put the Rattlers back in front with a two-out RBI double in the top of the sixth.
Mittelstaedt struck again in the top of the seventh. He stepped to the plate with two outs and none on base. Mittelstaedt lined a 1-1 pitch to the right field corner. The ball glanced off the foul pole just above the wall for a home run. Mittelstaedt's sixth home run of the season put the Rattlers up 3-1.
Rattlers starting pitcher Austin Ross tossed three scoreless innings and left the game in favor of Del Howell. Howell, who had not worked in a game since June 10, came on and allowed one run over three innings.
Stosh Wawrzasek worked a scoreless seventh inning, but issued a walk and gave up a double with one out in the eighth inning. The call went to Brian Garman.
The lefty got a strikeout and deep fly ball to left to preserve the 3-1 lead.
The Rattlers added an insurance run in the top of the ninth. Franklin Romero, Jr. singled and stole second. Mittelstaedt dropped a sacrifice bunt to move Romero to third. Mike Brownstein's sacrifice fly to center got Romero home and Wisconsin led 4-1.
Garman worked a 1-2-3 ninth inning for the save, his third of the season.
Wisconsin is off as a team until Friday night. The Timber Rattlers start the second half of the 2011 season at home on June 24 against the Quad Cities River Bandits. Game time is 7:05pm.
Four Timber Rattlers will be busy during the Midwest League All-Star Break. Chris Dennis, Austin Ross, Tyler Thornburg, and Mike Walker were selected by the managers of the Western Division to represent the Rattlers in the All-Star Game on June 21 at Modern Woodmen Park in Davenport, Iowa.
Fans in Wisconsin who are Time Warner Cable subscribers will be able to watch the game on Sports 32. Game time is 7:00pm.
WP: Del Howell (1-3)
LP: Brian Diemer (6-5)
SAVE: Brian Garman (3)