Arizona Diamondbacks’ Stunning Late-Season Surge: Key Highlights, Star Performances & Playoff Outlook

Key Takeaways • Arizona Diamondbacks ride dominant September pitching surge to tighten NL Wild Card race • Rookie right-hander Brandon Pfaadt strikes out eight as D-backs edge San Francisco Giants 6-5 in walk-off thriller at Chase Field • Torey Lovullo trims rotation to four arms, banking on Zac Gallen, Merrill Kelly, Jordan Montgomery and Pfaadt for stretch run • Bullpen posts 1.92 ERA over last 10 games; Paul Sewald converts eight straight saves • Corbin Carroll’s leadoff power and Lourdes Gurriel Jr.’s clutch bat fuel offense Arizona Diamondbacks heating up at perfect time PHOENIX — The Arizona Diamondbacks are proving that late-summer momentum can flip a postseason outlook overnight. A club that looked adrift in early August has rattled off six wins in its last seven contests, capped by Tuesday night’s dramatic 6-5 walk-off over the San Francisco Giants that pulled the D-backs within a half-game of the National League’s second Wild Card slot. Rotation reset sparks surge Manager Torey Lovullo’s bold decision to move to a four-man rotation after the Sept. 1 roster expansion is paying immediate dividends. Rookie Brandon Pfaadt, whose ERA sat at 5.40 on Aug. 20, has delivered three straight quality starts, including eight strikeouts over six frames Tuesday. Veterans Zac Gallen and Merrill Kelly have combined for a 1.67 ERA this month, while trade-deadline pickup Jordan Montgomery has stabilized the back end. Bullpen locking games down Arizona’s relief corps has quietly become one of MLB’s most efficient units in September. Closer Paul Sewald owns a 0.90 ERA with eight consecutive saves, and setup men Kevin Ginkel and Ryan Thompson have stranded 14 of 15 inherited runners. The group’s collective 1.92 ERA over the last 10 outings ranks second in the majors. Offense doing just enough Corbin Carroll, the reigning NL Rookie of the Year, continues to set the tone. The 25-year-old is slashing .333/.409/.556 in September and swiped his 41st base on Tuesday. Lourdes Gurriel Jr. leads the club with nine RBIs during the recent 6-1 stretch, while Christian Walker’s 31st homer provided insurance in Monday’s 8-4 victory. Standings snapshot Entering Wednesday, Arizona is 79-71, trailing the Chicago Cubs by 0.5 games for the second Wild Card and holding a one-game edge over both San Francisco and Cincinnati. FanGraphs now pegs the D-backs’ playoff odds at 54 percent, up from just 18 percent on Aug. 25. What’s next The Diamondbacks close their three-game set with the Giants tonight before hosting the struggling Colorado Rockies for four. With Gallen and Kelly lined up to face Colorado, Arizona has a clear opportunity to seize Wild Card control ahead of a season-defining road trip to Houston and Los Angeles. Bottom line Arizona’s formula is suddenly clear: shortened rotation, airtight bullpen and timely hits. If the D-backs can maintain their September pitching renaissance, a return to October baseball—just two years removed from a 110-loss season—looks increasingly plausible.