Oakland Athletics closer Blake Treinen has been voted September's American League Reliever of the Month Presented by The Hartford, and Milwaukee Brewers relief pitcher Corey Knebel has been voted the National League Reliever of the Month Presented by The Hartford for the sixth period of the 2018 season.
Treinen appeared in 11 games for the A's, converting four-of-five save opportunities and compiling a perfect 3-0 record en route to earning his second AL Reliever of the Month Award this season (also May). Across 13.1 innings pitched, the hard-throwing right-hander did not surrender an earned run and tallied nine strikeouts, while permitting just one walk and limiting the opposition to four hits. Treinen finished his strong 2018 campaign in impressive fashion, tossing 17.1 scoreless innings across 15 appearances. Included in his dominant stretch was an 11-game streak in which Blake did not permit a hit (August 25th-September 21st). The streak was the longest in franchise history by a reliever, and the longest for a relief pitcher in the AL since Justin Wilson's 11-game streak last season (April 4th27th). During his excellent month on the mound, Treinen became the 10th hurler since at least 1908 to toss 13.0-or-more innings while not permitting a run on four-or-fewer hits and no more than one walk. Seranthony Dominguez of the Philadelphia Phillies (May) and Freddy Peralta of the Milwaukee Brewers (June) also accomplished the feat this season. Overall, the 30-year-old finished his outstanding 2018 campaign with a 9-2 record to go along with 100 strikeouts, 38 saves and a 0.78 ERA over 80.1 innings pitched. The 2018 All-Star is the first pitcher in Major League history to ever record at least 100 strikeouts and 30 saves while holding an ERA below 1.00.
Others receiving votes for NL Reliever of the Month included Roberto Osuna (10 G, 10 SV, 1.54 ERA, 6 SO) and Ryan Pressly (1-0, 0.00 ERA, 12 G, 15 SO) of the Houston Astros; last month's Reliever of the Month Edwin Díaz (9 G, 1.93 ERA, 7 SV, 16 SO) of the Seattle Mariners; Ken Giles (9 G, 7 SV, 0.00 ERA, 8 SO) of the Toronto Blue Jays; Zach Britton (10 G, 0.00 ERA, 2 SV, 9 SO) and Chad Green (11, 1.59 ERA, 11.1 IP, 18 SO) of the New York Yankees; Taylor Rogers (10 G, 0.00 ERA, 10 SO, 2 BB) and Kohl Stewart (2-0, 1.33 ERA, 20.1 IP, 13 SO) of the Minnesota Twins; Taylor Cole (4-0, 1.32 ERA, 13.2 IP, 14 SO) of the Los Angeles Angels; and Juan Minaya (1-0, 0.77 ERA, 11.2 IP, 15 SO) of the Chicago White Sox. 
The American League Reliever of the Month presented by The Hartford, Blake Treinen, and the National League Reliever of the Month presented by The Hartford, Corey Knebel, will each receive a specially designed plaque, suitably engraved, for their accomplishments. The Hartford, the Official Business Insurance & Employee Benefits Sponsor of MLB, has presented baseball's annual Relievers of the Year Awards since 2015. The Hartford Presents the 2018 Relievers of the Year, named in honor of Mariano Rivera (American League) and Trevor Hoffman (National League), will again be presented during the World Series.