Today's starting pitchers: LHP Robbie Ray (7-12, 4.28) vs. LHP Jorge De La Rosa (8-7, 5.09). . . . Storylines: The Diamondbacks' 14-14 record in August was their best monthly record of the season, and they'll try to continue that through the final 29 games to build some momentum for 2017. They haven't crossed paths with the Rockies since June 26. Colorado leads the season series 8-5, but the D-backs have won 4 of 7 in Denver. The Rockies had a 4-game winning streak snapped in dismal fashion in the second game of Wednesday's double-header vs. the Dodgers, blowing an 8-2 lead by surrendering 3 runs in the eighth and 5 in the ninth. . . . Watch: 5 p.m., FOX Sports Arizona and FOX Sports GO.
D-backs starting pitcher Robbie Ray
If he can continue to command his fastball and keep his pitch count manageable, Ray appears poised to finish his season on a high note. He's 2-1 with a 1.50 ERA in his last 4 starts, with 29 strikeouts and 7 walks over 24 innings. But pitch-count issues reared their ugly head in his last start against Atlanta last Thursday. He took the loss while giving up 2 earned runs in 5 innings . . . Ray's average of 11.23 strikeouts per 9 innings is third best in the majors behind Jose Fernandez and Max Scherzer. . . . Ray was roughed up by Colorado for 5 runs and 9 hits over 4 2/3 innings at Coors Field on May 11, but his career record at Coors is 1-0 with a 2.76 ERA in 3 starts. Rockies outfielder Charlie Blackmon wears Ray out: 9 for 14 (.643) with a home run and a triple.
Mark J. Rebilas-USA TODAY SportsMark J. Rebilas
Rockies starting pitcher Jorge De La Rosa
De La Rosa escaped with no decision in his last start on Friday against the Nationals, giving up 8 hits and 3 runs over 5 innings while striking out 8. He's 2-0 with a 3.40 ERA in seven starts since July 20, but the Rockies have ended up losing 4 of those 7 games. . . . De La Rosa has made 24 career starts against the D-backs, going 10-8 with a 3.10 ERA. He's 1-0 in 2 starts against them this season, giving up 14 hits and 6 runs in 10 2/3 innings. . . . Chris Owings, Yasmany Tomas and Rickie Weeks Jr. all have career slugging percentages in excess of .700 against De La Rosa.
Andy Marlin-USA TODAY SportsAndy Marlin
Danger, danger everywhere
Even without rookie shortstop Trevor Story, the Rockies' lineup presents a massive challenge. . . . Second baseman D.J. LeMahieu hit .439 for the month of August with 43 hits and is now hitting a league-leading .345 for the season. Third baseman Nolan Arenado hit .356 in August with 36 RBI, a franchise record for any month, and he's been even hotter of late: 21 for 40 (.525) with 6 homers and 17 RBI in his last 10 games. And Charlie Blackmon hit .360 in August with 11 homers and 30 runs scored. . . . A new addition since the D-backs last encountered the Rockies is rookie outfielder David Dahl. He's hitting .333, stolen 5 bases and scored 33 runs since being recalled on July 25. He began his career with a 17-game hitting streak and has at least 1 hit in 32 of 35 games played.
Tim Heitman-USA TODAY SportsTim Heitman
A.J. is OK, and then some
After going 0 for 8 in his first 2 games since returning from a fractured elbow, A.J. Pollock s 6 for 12 with 3 runs, 2 walks and 4 stolen bases while also solidifying the D-backs' outfield defense. . . . Jean Segura, who leads the NL with 166 hits, and Pollock form a treacherous 1-2 punch at the top of the lineup ahead of the run-producing bats of Paul Goldschmidt, Jake Lamb, Welington Castillo and Yasmany Tomas.
Kelley L Cox-USA TODAY SportsKelley L Cox
Rest of the series
Saturday: RHP Braden Shipley (2-3, 4.75) vs. RHP Tyler Chatwood (10-8, 3.75), 4:30 p.m., FOX Sports Arizona. . . . Sunday: RHP Archie Bradley (5-8, 4.95) vs. RHP Jon Gray (9-6, 4.41), 12:30 p.m., FOX Sports Arizona.