O'Day was called up on Friday when Ogando had to return to the Dominican Republic.
"It's good to be back here," O'Day said. "It makes you want to be here. It makes you know where you want to be."
O'Day is a Major League reliever. He had a combined 1.84 ERA in 2009-10, the 16th lowest in the Major Leagues. He had a 2.03 ERA last season, the seventh lowest in the American League.
But he missed two months this season with a torn labrum in his left hip, and did not pitch effectively when he was activated off the disabled list July 2. The Rangers optioned him to Round Rock on July 14, and any chance of a quick and permanent return took a big hit when the Rangers acquired Mike Adams and Koji Uehara right before the Trade Deadline.
"[The trades] made me think I wouldn't be here until September," O'Day said. "If you get a chance to make the team better ... If I'm the general manager, I make the same trade. Obviously, it didn't put me in a good position, but that's part of the game."
He has a 3.11 ERA in eight appearances for Round Rock since being optioned on July 14.
"If you get sent down and feel sorry for yourself, you're going to get eaten alive," O'Day said. "I did in 2008 when I got sent down, and said I wouldn't do it again. This time I went down and pitched for a purpose. I had a couple of good years. I know I'm a good big league pitcher. It's where I belong."