The Philadelphia Union make their first-ever Major League Soccer playoff appearance this Sunday when they host the Houston Dynamo at 5 p.m. (ESPN2) at PPL Park in Chester, Pa., in the first of two legs in the quarterfinal round.

The winner is determined by total goals over the two matches, and the second game is away next Thursday at Roberston Stadium in Houston at 8:30 p.m. Eastern time.

On Wednesday, Press of Atlantic City soccer blogger James Clark joined KYW's Greg Orlandini, the Philadelphia Daily News' Kerith Gabriel and Philly Soccer Page's Eli Pearlman-Storch to preview the two-game series. Click on "KYW Philly Soccer Show podcast" parts 1, 2 and 3 in related links to listen.

And, make sure you visit James Clark's Soccer blog on Sunday morning for a preview of the Union's playoff opener. Don't forget to follow "James Clark's Soccer Blog" on Facebook for all the latest news from the "beautiful game."