Arizona Diamondbacks @ San Francisco Giants Prediction – August 28, 2026
The Arizona Diamondbacks travel to San Francisco to face the Giants in what projects to be a competitive NL showdown. According to the WP Baseball Predictor, the Giants hold a modest edge in this contest, with San Francisco carrying a 54.4% win probability compared to Arizona's 45.6%. With no dominant favorite in sight, the model's recommended play lands on Giants +1.5 on the run line — a pick that reflects a tight game where San Francisco is favored but by no means a sure thing.
Starting Pitcher Matchup: Drake vs. Tidwell
The mound matchup is the clearest differentiator heading into Friday night's game, and it represents a significant advantage for the home side.
Kohl Drake (Diamondbacks)
Kohl Drake takes the ball for Arizona carrying an xFIP of 5.07, a number that signals real concern about his ability to suppress runs against a capable Giants lineup. Expected Fielding Independent Pitching (xFIP) strips out defense and luck to measure a pitcher's true underlying performance, and a mark above 5.00 suggests Drake has been susceptible to hard contact and is at elevated risk of a difficult outing. Arizona's pitching staff as a whole carries a team FIP of 4.47 and a team ERA of 4.19, meaning Drake's individual xFIP sits notably worse than his team's collective baseline.
Blade Tidwell (Giants)
San Francisco counters with Blade Tidwell, who brings a far more encouraging xFIP of 3.60 to the Oracle Park mound. That figure reflects a pitcher who has been limiting damage efficiently, keeping the ball in the park and avoiding the kind of damaging contact that inflates run totals. Tidwell's xFIP of 3.60 compares favorably even to the Giants' solid team FIP of 4.24, indicating he has been one of San Francisco's more reliable arms. This gap — nearly 1.5 points of xFIP separating the two starters — is a primary driver behind the model's lean toward the Giants.
Team Offense and Pitching Context
Offensively, Arizona holds a slight edge with a team wOBA of 0.310 versus San Francisco's 0.308, though the difference is negligible and unlikely to be a meaningful tiebreaker. Both bullpens will be leaned on if either starter struggles to eat innings, and Arizona's deeper injury situation may limit their late-game flexibility.
Injury Report: Key Absences on Both Sides
Injuries loom large in this matchup, particularly for the Diamondbacks, who are dealing with a crowded IL heading into the series.
Diamondbacks Injuries
- Ketel Marte (Knee, 10-Day IL) – A significant offensive absence for Arizona's lineup.
- Lourdes Gurriel Jr. (Thigh, 10-Day IL) – Another key bat unavailable for Arizona.
- Yordin Chalas (Undisclosed, 7-Day IL)
- Modeifi Marte (Undisclosed, 7-Day IL)
- Aramis Garcia (Undisclosed, 7-Day IL)
Giants Injuries
- Willy Adames (Elbow, 10-Day IL)
- Marcelo Mayer (Forearm, 10-Day IL)
- Victor Bericoto (Knee, 10-Day IL)
- JT Brubaker (Ribs, 15-Day IL)
- Adrian Houser (Forearm, 15-Day IL)
Both clubs are navigating meaningful absences, but Arizona's loss of Marte and Gurriel represents a heavier blow to their run-producing core, potentially compounding the challenge of facing a pitcher with Tidwell's underlying profile.
Dark Horse Home Run Picks
Looking for long-shot power upside in this matchup? Here are tonight's dark horse HR picks to watch:
- Corbin Carroll (Diamondbacks) – Carroll's speed and athleticism can translate into power in the right matchup. Keep an eye on him against Tidwell.
- Jonah Cox (Giants) – Cox is the local dark horse pick, capable of making noise in Oracle Park conditions if he gets his pitch from Drake.
WP Baseball Predictor Final Pick
With Blade Tidwell's xFIP of 3.60 holding a commanding edge over Kohl Drake's 5.07, a depleted Diamondbacks lineup, and the model projecting a 54.4% win probability for San Francisco, the WP Baseball Predictor recommends Giants +1.5. This is a close game on paper — but the pitching edge and injury context make San Francisco the measured play for August 28.