Overmatched and perhaps fatigued from their late season run, the Centennials appeared easy prey for the Majors during the first round of the postseason.  Kellerman started games 2 through 4 of the four game sweep which included an overtime loss in Toronto.  Kellerman had the distinguishment of playing in the last ever Centennials home game after 20 proud years in North Bay.  Coming around full circle, he started the first ever Saginaw Spirit game before a near sell-out crowd in the newly rennovated Saginaw County Events Center.  The Spirit despite strong fan support and a host of returning players from the previous year quickly sunk to the basement of the tough Western Conference during the 2002-'03 season.  At the trade deadline the Spirit traded some of their most valuable players in order to rebuild.

With the Spirit sitting near the bottom of the standings early in the season, Kellerman was picked to represent the Spirit in the 2002 Hershey Cup All-Star series, he along with four Rangers who were elected to the team (3 that participated) defeated the Eastern half of the QJHML 2-0.  Kellerman split the shutout with then Sting netminder: Robert Gherson.  Perhaps even more impressive than his work during the All-Star game was Kellerman's first star performance in a come-from-behind 3-3 tie to the Kitchener Rangers on November 15th where he made 56 stops on 59 shots on goal.

In September of 2003, with the Spirit looking anxiously towards the future rookie netminder: Eric Pfligler was signed to work in tandem with sophomore wonder: Mike Brown who by season's end in Saginaw was taking away playing time from Tyson Kellerman in the Spirit's first season.  The writing was on the wall for Kellerman and the Spirit sent the third year netminder home to await a trade.  Kellerman practiced with the Kingston Tier II team in order to remain close to game shape.  The big day finally came early in the season when he was traded to the Rangers for a conditional 3rd rounder.  With the Rangers Kellerman had several first star performances including two against the Otters but proved to be very inconsistent.  With the trade deadline looming the Rangers exchanged him for another struggling veteran netminder: Brad Topping from the Brampton Battalion.

Being 6'2" tall Kellerman covers lots of net, even when he goes down to stop shots.  Kellerman leaves virtually no rebounds when shots hit him in the chest area, which is very unique amongst nearly all netminders.  Unfortunately Tyson struggles with his glove hand, as well as play outside of the net.  When he's on his game regardless of whom he comes into contact with during the postseason, he does pose a very legitimate threat.