Philadelphia Phillies vs Arizona Diamondbacks Forecast, 9/20/2025 MLB Selections, Top Wagers & Odds

Home » Philadelphia Phillies vs Arizona Diamondbacks Forecast, 9/20/2025 MLB Selections, Top Wagers & Odds

Matchup: Philadelphia Phillies vs Arizona Diamondbacks

Event Date: Saturday, September 20, 2025

Venue: Chase Field, Phoenix, AZ

Broadcast: DBACKS.TV

Betting Odds: Philadelphia (-160) Arizona (+132)

The Arizona Diamondbacks (77-76) will clash with the Philadelphia Phillies (91-62) at Chase Field this Saturday. The moneyline favors the Phillies at -160, while the Diamondbacks stand at +132. The over/under is set at 9. Expected starting pitchers for the matchup are Taijuan Walker and Zac Gallen.

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The Philadelphia Phillies are currently averaging 4.9 runs per game, ranking them 8th in the league. They have accumulated a total of 743 runs with an on-base percentage of .330. As a team, the Phillies have 255 doubles and 197 home runs. They have also notched up 718 RBIs and 1,350 hits for the season, holding a batting average of .259. Their slugging percentage stands at .431, with a total of 1,245 strikeouts and 504 walks.

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The Phillies have a strikeout-to-walk ratio of 3.35 and maintain a collective WHIP of 1.24. The pitching staff has allowed 167 home runs and 619 total runs (7th in MLB). With 1,269 hits surrendered (8.4 per 9 innings) and 582 earned runs, the Phillies hold a team ERA of 3.86 (10th in the league), with 1,389 batters struck out. They have also walked 415 opposing hitters, and the team’s FIP is 3.73 this year.

This season, Phillies relief pitchers have entered games with runners on base 98 times and have appeared in 168 high-leverage situations. The bullpen has recorded 78 holds (22nd in the league) and achieved a save percentage of 63.4%, having been involved in 152 save situations. With 45 successful saves and 26 blown saves from 71 attempts, the relievers have inherited 143 base runners, with 32.9% scoring runs. The Phillies utilized 476 relievers on the mound this season.

So far, the Philadelphia Phillies have recorded 4,075 putouts, 1,305 assists, and 56 errors, giving them a fielding percentage of .990, which ranks 3rd in Major League Baseball. They’ve converted 69.1% of balls put in play into outs over their 12,225 innings, placing them 21st in the league.

Walker has logged 1,270 innings in his career with 1,081 strikeouts, posting an earned run average of 4.19 (592 earned runs allowed) and a WHIP of 1.286. He has allowed 1,204 hits (8.5 hits per nine innings) and issued 429 walks. With a career win-loss mark of 77-71, Walker’s FIP stands at 4.13, and he has faced 5,391 major league hitters.

The Arizona Diamondbacks have posted an on-base percentage of .324, combined with a batting average of .251 this year. They have struck out 1,235 times (23rd in the league) and accumulated 1,297 hits, including 205 home runs and 737 RBIs. The team holds a slugging percentage of .434 and averages 4.95 runs per game (5th in the league). They have achieved 260 doubles, secured 513 walks, and scored 758 runs.

The Arizona pitching squad has permitted 731 runs this season, with a 4.44 ERA (673 earned runs allowed). They’ve allowed 181 home runs and give up 4.82 runs per 9 innings (23rd in the league). The Diamondbacks have a team WHIP of 1.309 and a FIP of 4.26 for the season. Additionally, they boast a K/BB ratio of 8.00 (1,209 strikeouts against 470 walks), currently sitting 24th in MLB for total hits allowed with 1,315.

Arizona’s bullpen has been called upon in 70 save situations, successfully converting 41 saves, ranking 22nd in the league with a save rate of 58.6%. They have deployed 470 relievers this season, with 158 appearances in high-leverage situations and 140 with runners on base. The inherited score percentage for Arizona relievers stands at 34.1% out of 185 inherited runners. The Diamondbacks have totaled 123 double plays and maintain a fielding percentage of .986 (15th in MLB), with 1,376 assists, 77 errors, and 4,092 putouts this season. Their defensive efficiency is recorded at 69.7% over 12,276 innings (20th in baseball).

In his career, Gallen has yielded 832 hits while accumulating 1,048 strikeouts over 995 innings. Gallen (65-51 career win-loss record) has achieved a 3.55 earned run average and allows 7.5 hits per nine innings. He has given up 393 earned runs, holding a WHIP of 1.156 and a FIP of 3.5. Gallen possesses a K/BB ratio of 3.29 and has faced 4,090 hitters throughout his career.

Who will prevail in tonight’s MLB matchup against the spread or moneyline?

Josh Schonwald’s Prediction: Take Philadelphia (-160)

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