According to TV Guide, the last three series he's been on — The Fugitive, Eyes, The Nine — all got nixed during their first seasons.
"I tend to approach everything with a healthy amount of optimism," he told the magazine while hanging out at the Lucky Suite, where he picked up some Cosabella lingerie and True Religion jeans for his wife and daughter.
"I just don't want to get my heart broken again. You just never know."
Still, Private Practice is and will continue to be one of the most buzzed about shows this summer after its back-door pilot - embedded in a special two-hour episode of Grey's Anatomy - drew 21 million viewers.
"We all figured it would do great since the pilot was included in a Grey's Anatomy episode," said Tim Daly. "But it's really exciting."
Meanwhile, Daly's co-star Merrin Dungey, is a little more enthusiastic, at least about being cast on the Grey's Anatomy spin-off.
"I actually screamed when I saw myself on next week's clips," Dungey said at ABC's Upfront party. "It's like being cast on your favorite show. I feel like I'm Mike TV from Willy Wonka."