After a 17-year hiatus, George Michael is giving the U.S. touring market one more try. Tickets for his summer outing, which begins June 17 in San Diego, go on sale this weekend.

Michael may also have a hit on his hands in the form of his retrospective album "Twenty Five," released earlier this week via Epic. The set is on course for a top 25 debut on The Billboard 200 chart next week, based on its first day sales on Nielsen SoundScan's Building Chart.

Michael promoted the tour and album today (April 4) on "The Ellen DeGeneres Show," where he called in and offered up a pair of tickets to his June 25 Los Angeles show to everyone in the audience. DeGeneres' Web site is also giving away a pair of tickets to each tour stop.

Here are George Michael's tour dates:

June 17: San Diego (Sports Arena)
June 19: San Jose, Calif. (HP Pavilion)
June 21: Las Vegas (MGM Grand Garden Arena)
June 22: Phoenix (US Airways Center)
June 25: Los Angeles (The Forum)
July 2: Seattle (Key Arena)
July 4: Vancouver (GM Place)
July 9: Chicago (United Center)
July 13: Dallas (American Airlines Center)
July 14: Houston (Toyota Center)
July 17: Toronto (Air Canada Centre)
July 18: Montreal (Bell Centre)
July 21, 23: New York (Madison Square Garden)
July 26: Philadelphia (Wachovia Center)
July 27: Boston (TD Banknorth Garden)
July 29: Washington, D.C. (Verizon Center)
July 31: Atlanta (Philips Arena)
Aug. 2: Tampa, Fla. (St. Pete Times Forum)
Aug. 3: Sunrise, Fla. (Bank Atlantic Center)

Additional reporting by Keith Caulfield, L.A.