For the second weekend in a row, the Arizona Diamondbacks have a chance to take command of the NL West. 

Less than a week ago, it looked like what was once an intriguing race in the NL West was being decided before September even began. 

MEDICAL WATCH: OF Justin Upton (headache) didn't play Sept. 

--OF Adam Dunn's walk-off double in the ninth inning Wednesday was his first game-winner since joining the D-backs on Aug. 

Outfielder Eric Byrnes was encouraged by the results of a Tuesday MRI on his left hamstring that showed significant healing, but he understands time is running out on a return to the Diamondbacks this season. 

Can Cliff Lee become MLB's first 25-game winner since 1990? It's one of nine things Tracy Ringolsby will be watching for this month. 

With his slumping team down three runs in the sixth inning, Arizona manager Bob Melvin started making notes for a postgame pep talk. 

Adam Dunn doubled home the winning run in the ninth inning, and the Arizona Diamondbacks beat the St. 

Adam Dunn doubled home the winning run in the ninth inning, and the Arizona Diamondbacks beat the St. 

As the Labor Day weekend fades into memory, the Closer Hot Seat finds itself rather short on tenants. 

The Arizona Diamondbacks' inconsistency at the plate is a big reason they have been unable to open a comfortable lead in the weak NL West. 

Adam Wainwright refuses to count St. 

Adam Wainwright helped himself by doubling in two runs, and Troy Glaus hit one of St. 

Adam Wainwright helped himself by doubling in two runs, and Troy Glaus hit one of St. 

Adam Wainwright helped himself by doubling in two runs, and Troy Glaus hit one of St.