The Arizona Diamondbacks had their five-game winning streak snapped Friday night when they allowed the Colorado Rockies to come back and steal a 3-2 victory. Arizona will try to get back in the win column Saturday May 23 behind Zac Gallen, who will face off against Rockies' Michael Lorenzen. It's a late 7:10 p.m. MST first pitch. The D-backs have a 26-24 record while the Rockies are 20-32. But, in particular, the Diamondbacks need one thing from Gallen: a deep outing, as Arizona's bullpen had a rough night on Friday. Diamondbacks Rockies Starting Pitching MatchupApr 18, 2026; Phoenix, Arizona, USA; Arizona Diamondbacks pitcher Zac Gallen (23) throws against the Toronto Blue Jays in the first inning at Chase Field. Mandatory Credit: Rick Scuteri-Imagn Images | Rick Scuteri-Imagn ImagesMichael Lorenzen just faced the D-backs last week in Colorado, and was hit hard, giving up seven runs, six earned, in 4.2 innings. The D-backs won that game 8-6. Lorenzen is 2-6, with a 7.03 ERA. His six losses are the most in MLB. Looking at the head to head matchups, Corbin Carroll is the biggest threat to the Rockies right-hander. Carroll has two homers against Lorenzen, including one in the game May 17. Note Lourdes Gurriel Jr. was removed from the table below as he is day to day with a hamstring injury and is getting imaging on Friday morning. News of a roster move is still pending as of this writing. Current D-back hitters vs Michael Lorenzen | Baseball-ReferenceZac Gallen's most recent start was of the quality variety, going six innings and allowing just two runs to the Giants in a 12-2 D-backs rout. He was pulled after just 81 pitches. It was just the second quality start of the year for Gallen, who has a 2-4 record with a 4.78 ERA. Gallen did not pitch in the Coors Field series last week. Ezequiel Tovar has been a thorn in Gallen's side in his career so far, going 6-for-13, .462 against him. Gallen faced the Rockies on May 17 last year at Chase Field and gave up six runs in a 14-12 Rockies win. Current Colorado Rockies vs Zac Gallen stats | Baseball-ReferenceDiamondbacks vs Rockies BullpensMay 10, 2026; Phoenix, Arizona, USA; Arizona Diamondbacks pitcher Juan Morillo against the New York Mets at Chase Field. Mandatory Credit: Mark J. Rebilas-Imagn Images