St. Louis Cardinals vs Arizona Diamondbacks MLB Prediction and Pick, Today’s MLB Betting Picks, 7-18-2026

St. Louis Cardinals vs Arizona Diamondbacks MLB Prediction and Pick, 7-18-2026. Today’s MLB Betting Picks – Best available odds at YouWager.lv. Claim your signup bonus.

Our St. Louis Cardinals vs Arizona Diamondbacks Pick: D-BACKS

Arizona is the recommended pick because it has the edge in the starting pitching matchup and owns one of the league’s strongest defensive units. Brandon Pfaadt’s career ERA has been higher than ideal, but the Diamondbacks back him with a defense that ranks third in Major League Baseball in fielding percentage and fifth in defensive efficiency, helping limit additional scoring opportunities. Arizona’s bullpen has also been more reliable, converting 71.4% of its save chances compared to St. Louis’ 65.9% rate. While the Cardinals have been slightly more productive offensively and have comparable overall pitching numbers, Arizona’s superior defense and steadier bullpen provide an advantage in what projects to be a competitive game. If the Diamondbacks receive a solid outing from Pfaadt and continue their strong defensive play, Arizona has the edge to secure the victory.

MATCHUP | Cardinals | Diamondbacks
St. Louis Cardinals vs Arizona Diamondbacks Moneyline | +125 | -145
Where | Chase Field in Phoenix, AZ
When | Saturday, July 18, 2026

St. Louis Cardinals vs Arizona Diamondbacks MLB Prediction – 7-18-2026 – MLB Betting Picks

Here is our St. Louis Cardinals vs Arizona Diamondbacks MLB Prediction for both teams:

Cardinals Preview

St. Louis is batting at a rate of .390, has been called out on strikes 735 times, and has walked 304 times. Over the season, they had 767 base knocks and 417 runs batted in, with a team batting average of.242. Together, the Cardinals have hit 107 balls out of the ballpark and recorded 131 doubles. They have a team on-base percentage of.318 and 429 runs. The St. Louis Cardinals are currently ranked 14th in MLB with an average of 4.5 runs per game.

The Cardinals’ staff has struck out 715 batters this season, and they rank 12th in baseball with an earned run average of 4.13. In addition to giving up 423 runs overall (14th in MLB), Cardinals pitchers have allowed 94 home runs. Throughout the season, they have walked 318 opponents, and as a team, their FIP is 4.15. St. Louis has given up 389 earned runs and 809 base hits (8.6 every nine innings). The pitching staff’s WHIP is 1.33, and their K/BB ratio is 2.25.

With 110 save situations, the Cardinals bullpen has a save percentage of 65.9%. They have made 29 saves this season, while 15 of their 44 save opportunities have gone unconverted. 35.3% of the 156 base runners that the relief pitchers have inherited this season have crossed the plate. Relief pitchers for the Cardinals have made 109 appearances in high-leverage situations and have entered the game 106 times with opponents on base. Throughout the season, the Cardinals have sent 324 relievers to the mound. Throughout the season, the relief pitchers have amassed 63 holds, ranking fourth in MLB.

The Cardinals are now ranked 17th in professional baseball after converting 69.7% of balls in play into outs in 7,638 innings on the diamond. This season, the St. Louis Cardinals have recorded 2,546 putouts, 889 assists, and 46 mistakes. They have earned 84 double plays and maintain a fielding percentage of.987, which is 12th in professional baseball.

Throughout his professional baseball career, May has pitched 417 innings and had 386 punch outs. He has a career WHIP of 1.213 and an earned run average of 4.01 (186 earned runs allowed). With 141 free passes, he has given up 365 base hits (7.9 hits every nine innings). May, who has a 24-26 career record, is up against 1,745 major league batters with a FIP of 3.95.

Diamondbacks Preview

Arizona has amassed 397 runs batted in and 89 long balls this season. They have scored 416 runs, scored 161 doubles, and received 304 free bases. Throughout the season, the Arizona Diamondbacks have a team batting average of.237 and an OBP of.307. The Diamondbacks score 4.33 runs per game (19th in MLB) and have a team slugging percentage of.384. They have 755 base hits and have struck out 702 times (28th in baseball).

With a club ERA of 4.21 (396 earned runs surrendered), the Arizona pitching staff has given up 429 runs so far this season. They allow 4.56 runs per nine innings (18th in MLB) and have allowed 116 home runs. Thus far this season, the Diamondbacks have a FIP of 4.43 and a team WHIP of 1.270. With 655 strikeouts and 273 walks, their K/BB ratio is 7.00. As a pitching staff, they rank 22nd in MLB with 802 total hits allowed.

Out of 115 inherited runners, Arizona bullpen pitchers have an inherited score percentage of 27.0%. In addition to 81 instances with base runners, their bullpen pitchers have taken the mound 102 times in high-leverage situations. The Diamondbacks have 90 save situations, 54 holds, and 10 blown saves. They have sent 314 bullpen pitchers to the mound this season and are ranked eighth in MLB with a save percentage of 71.4%.

The Arizona Diamondbacks have a fielding percentage of.990 (third in MLB) and have received 80 double plays. Thus far this season, the Diamondbacks have earned 2,540 putouts, 843 assists, and 35 mistakes. The Diamondbacks have a defensive efficiency of 71.5% after 7,620 innings on the field, which ranks them fifth in professional baseball.

Pfaadt has struck out 467 batters in 507 innings while giving up 543 base knocks during his professional baseball career. With a 30-29 career record, Pfaadt has an earned run average of 5.09 and allows 9.6 hits per nine innings. With a WHIP of 1.313 and a FIP of 5.0, he has allowed 287 earned runs. Throughout his MLB career, he has faced 2,179 opposing batters and has a strikeout to walk ratio of 3.80.

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St. Louis Cardinals vs Arizona Diamondbacks MLB Prediction and Pick, 7-18-2026. MLB Betting Picks, by YouWagert.lv