The Miami Heat have exercised the team option for the final year of guard Mario Chalmers' contract on Friday, making him only the third player the club has locked in for the coming season. Chalmers is due to make just over $850,000 in his third season. The Heat had until next week to decide on the deal. He has started 104 games in two seasons with the Heat, averaging 8.6 points and 4.2 assists. http://sports.espn.go.com/nba/news/story?id=5303015
