Gregerson has consistenly been one of the best relievers in the game over the past five seasons, as he has a career 2.93 ERA over 336 appearances. The right-hander has looked just as sharp this season, as he owns a 2.98 ERA with 37 strikeouts in 42 1/3 innings.
Street closed games for the Oakland Athletics and Colorado Rockies before serving the same role for the Padres. The veteran owns a 3.78 ERA with 18 saves on the season, but there are a number of red flags that should make potential suitors wary. Street has seen his strikeout numbers evaporate, as he has only fanned 22 batters in 33 1/3 innings, and has already surrendered 10 home runs.
Gregerson, who is making $3.2 million this season, has one more season of arbitration left and will be eligible for free agency after 2014. Street is due $7 million in 2014 with a club option for $7 million in 2015.