He's just in his third season of pro hockey, but NHL defenseman Matt Carle of Anchorage is getting a thorough understanding that it's a business -- today, he was traded for the second time in four months.

Carle, 24, was traded from the Tampa Bay Lightning to the Philadelphia Flyers, getting shipped along with a third-round draft pick in 2009 for defenseman Steve Eminger, forward Steve Downie and a fourth-round pick next summer.

And check this out -- the Lightning play at the Flyers on Saturday night.

Carle owned 1-1--2 totals and a +1 rating in 12 games with the Lightning, and had logged an average of 21:57 of ice time per game.

Carle won two national championships at Denver and also won the Hobey Baker Memorial Award as college hockey's best player. He was an All-Rookie selection in his first season in San Jose, where he played his first two seasons in the NHL.

In his All-Rookie season, Carle racked 11-31--42 and +9 totals in 77 games. He slumped last season to 2-13--15 and -8 totals. Even so, early last season the Sharks last November signed him to a four-year contract extension worth $13.75 million. Carle makes $2,950,000 this season.