Here is the eighth in an 18-part series examining the Chicago Bears' unrestricted free agents.
Position: Wide receiver/return man
Age: 28
NFL experience: Six years
2015 salary: $660,000
2015 key statistics: 22 receptions for 300 yards; 29 punt returns for 192 yards and 16 kickoff returns for 418 yards.
Probability to return: Moderate
Outlook: Mariani plays with maximum effort. He leaves it all on the field. You have to give Mariani credit for finishing the year on a high note after special teams coordinator Jeff Rodgers wanted to bench him outright.