The Philadelphia Phillies open a three-game set in Phoenix on Monday night with something real on the line for both clubs. Philadelphia is 77-60 after sweeping the Angels in Anaheim. Arizona is 73-65 and holding the third National League wild-card spot. The Phillies are short moneyline favorites at -126, and the D-backs sit at +106 at home. The more interesting number is the total, which has already moved off its opening figure. That move is where our strongest read starts.
Last Updated: Monday, August 31, 2026
Philadelphia Phillies vs. Arizona Diamondbacks — Time & How to Watch
| Where | Chase Field, Phoenix, Arizona |
| When | Monday, August 31 — 9:40 p.m. ET |
| TV | NBC Sports Philadelphia, DBACKS.TV |
Philadelphia Phillies vs. Arizona Diamondbacks Betting Preview
The pitching matchup is the whole game here, and it is not the one the season lines suggest. Arizona sends out Brandon Pfaadt, who is 7-1 with a 3.51 ERA and a 1.14 WHIP across 105 innings. His profile is command, not swing-and-miss. He walks 2.2 per nine and strikes out only 6.2 per nine, so he lives on weak contact.
His recent line splits in two. He threw 20.2 scoreless innings from August 3 through August 14. Then the contact caught up, with five earned runs at Boston on August 19 and four more against the Cubs on August 25.
Aaron Nola’s season line reads worse than he has been. He carries a 5.03 ERA and a 1.399 WHIP with 153 strikeouts in 143 innings. However, that number is out of date. Over his last six starts he has allowed 10 earned runs in 34.2 innings, a 2.60 ERA. His 9.6 strikeouts per nine is well clear of Pfaadt’s rate.
Form favors the road team. Philadelphia is 8-2 in its last 10 with a plus-18 run differential and a 2.90 staff ERA. Arizona is 6-4 with a 4.30 ERA. Kyle Schwarber leads the majors with 40 home runs. Still, the D-backs are 40-29 at Chase Field.
Lineup context cuts against Arizona. Ketel Marte has been on the 10-day injured list since August 20 with knee inflammation and is expected back during this series, though he was not confirmed active for Monday. Lourdes Gurriel Jr. remains out. Philadelphia is without Adolis García for the season. More in our latest MLB picks coverage.
Philadelphia Phillies vs. Arizona Diamondbacks Odds
| Run Line | Moneyline | Total | |
|---|---|---|---|
| Phillies | -1.5 (+135) | -126 | U 8 (-105) |
| Diamondbacks | +1.5 (-160) | +106 | O 8 (-115) |
Odds accurate as of August 31, 2026 via TheSpread.com. Odds change, get the latest MLB Odds – Futures – Props
Philadelphia Phillies vs. Arizona Diamondbacks — Who Is the Public Betting?
| Phillies | 56% | 44% | Diamondbacks |
See the latest MLB Public Betting Splits and make smarter wagers!
Phillies vs. Diamondbacks Prediction — Number Getting Smaller?
The total opened at 8.5 with the under juiced to -120. It now sits at 8, with the under the cheaper side at -105. That is a full half-run of downward movement, and the direction is the clearest market signal in this game. Money came in low, the number came down through it, and the book repriced. Nobody is getting 8.5 anymore, but the read behind the move still holds.
The baseball supports it. Both offenses average about 4.5 runs per game, so neither lineup is built to blow past this number on its own. Pfaadt’s 2.2 walks per nine means very little free traffic, and free traffic is what turns a two-run inning into a five-run inning. Nola is missing bats again. Arizona also enters without Marte and Gurriel Jr., which thins the middle of the order.
The case against is mostly bullpens. Arizona has run a closer-by-committee since designating Paul Sewald for assignment, and its pen worked hard through the weekend at San Francisco, including a doubleheader split. Philadelphia’s relief corps ranks around 19th in bullpen ERA. If either starter exits in the sixth, the late innings get loud.
The Pick: Under 8 (-105)
Phillies vs. Diamondbacks Prediction — Does Dog Have Value?
Arizona opened as a small moneyline favorite at -101. It is now a plus-money home underdog at +106, while Philadelphia moved from -119 to -126. Look at where the tickets are. Sixty-eight percent of moneyline bets sit on the Phillies, along with 56 percent of run-line bets. The line has moved in the same direction as the crowd, which is what a public-driven move looks like. That kind of movement carries little information, so the price on Arizona has drifted without a sharper reason behind it.
On the field, the D-backs are 40-29 at home behind the pitcher with the better command profile, in a game the total says should stay tight. In contrast, the counter-case is strong. Nola has been the better pitcher for six weeks, Philadelphia is riding a four-game winning streak, and Arizona is short two regulars until Marte is cleared. This is a lean built on price and venue, not a claim that Arizona is the better team.
The Pick: Diamondbacks Moneyline (+106)
Final Thoughts and Bonus Angle
Both plays rest on the same read: a tight game at an air-conditioned Chase Field where the starters keep traffic down. That correlation is worth naming. If the game breaks open early, both tickets are in trouble together.
The swing moment is the third time through Arizona’s order against Nola, who has worked at least five innings in each of his last six starts. Marte’s status is the other variable. If he is activated and in the lineup, Arizona’s run expectation rises and the under gets harder.
Picks recap: Under 8 (-105) is the stronger play, backed by the half-run down move and two starters who limit free baserunners. Diamondbacks Moneyline (+106) is the secondary lean, taken because a public-driven move pushed a 40-29 home team to plus money.
MLB Phillies vs. Diamondbacks FAQ: Monday August 31, 2026
What time does the Phillies vs. Diamondbacks game start?
First pitch is scheduled for 9:40 p.m. ET on Monday, August 31, 2026, which is 6:40 p.m. local time in Phoenix. The game opens a three-game series at Chase Field, the first of three straight meetings between the two clubs this week.
What channel is the Phillies vs. Diamondbacks game on?
The game airs on NBC Sports Philadelphia in the Phillies market and on DBACKS.TV in the Arizona market. Coverage runs through each club’s regional feed rather than a national window.
Who is pitching for the Diamondbacks tonight?
Right-hander Brandon Pfaadt is the listed probable starter for Arizona, carrying a 7-1 record and a 3.51 ERA. He is opposed by Phillies right-hander Aaron Nola, who is 5-10 with a 5.03 ERA. Pfaadt has allowed nine earned runs over his last two starts.
Where do the Phillies and Diamondbacks stand in their divisions?
Philadelphia is 77-60 and sits second in the National League East, five games back. Arizona is 73-65 and sits second in the National League West, 9.5 games back. Both clubs are inside the wild-card picture, with the Phillies ahead of the D-backs.
What is the season series record between the Phillies and Diamondbacks?
Arizona leads the 2026 season series 2-1. All three earlier meetings were played at Citizens Bank Park from April 10 through April 12. The Diamondbacks took the finale 4-3, the most recent meeting between the clubs.