PLAYOFFHOTELS
MLB · JULY 17, 2026 ● LIVE

St. Louis Cardinals at Arizona Diamondbacks

Chase Field · Phoenix, AZ

THE PICK

STL St. Louis CardinalsAWAY · 1508 ELO
@
Arizona DiamondbacksHOME · 1505 ELO ARI
49.1% WIN PROBABILITY 50.9%

The model makes Arizona Diamondbacks a 50.9% favorite — home advantage included. One game is one game: a 50.9% edge still loses 49.1 times in 100.

Prediction history

6 UPDATES

Every time the model moved this pick — logged in full. It updates until 15 minutes before gametime, then locks.

50.9% Arizona Diamondbacks ▼ -2.0
Ratings shifted on the latest results run.
52.9% Arizona Diamondbacks ▲ +0.5
Ratings shifted on the latest results run.
52.4% Arizona Diamondbacks ▲ +0.2
Ratings shifted on the latest results run.
52.2% Arizona Diamondbacks ▲ +0.5
Ratings shifted on the latest results run.
51.7% Arizona Diamondbacks ▲ +0.7
Ratings shifted on the latest results run.
OPEN
51.0% Arizona Diamondbacks OPENING LINE
First model run when the matchup posted. Elo gap of 3 points at open.

The factors

1 IN THE NUMBER

Everything the model sees for this game. Only backtest-validated signals move the probability — the rest is context, shown anyway.

PROBABLE STARTERS

Michael McGreevy FIP 4.14 · ERA 3.01 · 101.2 IP
Merrill Kelly FIP 5.90 · ERA 5.38 · 93.2 IP

GAME-TIME CONDITIONS · RETRACTABLE ROOF · NIGHT GAME

90°F DEW 65°F HUM 43% WIND 3 MPH CLOUD 44% 972 hPa

SCHEDULE & TRAVEL

STL REST 4D ARI REST 4D STL TRAVELED 1270 MI STL CROSSED 1 TIME ZONE

IN THE NUMBER

PITCH -14 ELO

The numbers

AWAY

St. Louis Cardinals
ELO RATING1508
RANK#13
RECORD50-45
LAST 104-6
STREAKL1

HOME

Arizona Diamondbacks
ELO RATING1505
RANK#15
RECORD49-47
LAST 106-4
STREAKW4

Ratings come from every MLB result this season — updated daily, weighted by margin of victory, with Arizona Diamondbacks getting the standard home bump. An Elo difference of 3 points plus home advantage at Chase Field produces the 50.9% call. Full methodology →

What could break the pick

St. Louis Cardinals are 4-6 over their last ten. This is a coin-flip game — the model calls it a lean, not a lock. Starting pitchers, lineup cards, and bullpen usage move real outcomes in ways a rating system can’t see.