Source: Matt Snyder, CBS Sports 
The six-time All-Star has been among baseball’s best closers for years and there’s little reason to believe he can’t hold onto that for at least one more year, even as he approaches 40.
2. Brian Wilson. Age: 31
Wilson posted a 0.66 ERA, 0.88 WHIP and 13 strikeouts in 13 2/3 innings in the regular season after returning from Tommy John surgery.
3. Grant Balfour. Age: 36
Last season, he saved 38 games in 41 chances with a 2.59 ERA.
4. Edward Mujica. Age: 30
He was outstanding for most of the season but fell apart in September, posting an 11.05 ERA and allowing as many home runs (three) as he posted strikeouts.
5. Fernando Rodney. Age: 37
This past season, while he did save 37 games — and it’s an overrated stat, by the way — he blew eight and the control issues that plagued him throughout his career resurfaced.