3 MLB Batter Props to Back on July 31: Witt Jr., Siri, and Moniak All Offer Value

The Friday slate is loaded with batter prop value once you dig past the marquee strikeout numbers, and three names stand out for anyone leaning into hits, total bases, and combo props tonight: Bobby Witt Jr., Jose Siri, and Mickey Moniak. All three are priced with enough market inefficiency to warrant a hard look, and the underlying data backs up the numbers being offered.

None of these are chalk “he’s hot” plays. Each one is grounded in a specific matchup or park factor that the market appears to be underpricing. Here’s the breakdown, prop by prop.

Bobby Witt Jr. Over 1.5 Total Bases (-103)

Witt is having another monster season for Kansas City, hitting .286 with 13 home runs, 39 RBIs, and 30 stolen bases across 360 at-bats, good for an .816 OPS. He’s been on a power surge over his last 30 games, batting .292 with a .442 slugging mark and four homers in that stretch, and he’s crossed the 1.5 total bases threshold in three of his last six games, including a three-hit, two-homer eruption on June 30 against Tampa Bay that produced nine total bases in a single game.

A .462 slugging percentage on the season means Witt is averaging well north of one total base per at-bat even before accounting for extra-base pop, and he typically sees 4-plus at-bats a night as Kansas City’s leadoff or two-hole hitter. At -103, the number is basically a coin flip priced fairly close to even money, but Witt’s volume of contact plus his extra-base frequency gives this side real lean. He doesn’t need a home run to clear 1.5 — a double and a single, or two singles plus a stolen base advancing him into scoring position, both get the job done given how the total bases market compounds hits.

Jose Siri Over 0.5 Hits+Runs+RBIs vs. Brewers (-128)

Siri’s counting-stat prop is one of the more mispriced numbers on the board. He’s hitting .259 with five home runs and 18 RBIs in 85 at-bats, and while his batting average has cooled over his last seven games (.214), he’s still notching extra-base contact — a homer and two RBIs in that stretch — and he scored a run as recently as his last outing. The “hits + runs + RBIs” combo prop only needs one single positive event across three separate categories to hit, which is a much lower bar than a standalone hits or total bases prop.

An independent OptaAI model projects Siri’s fair line at roughly -421 for clearing this same threshold, a significant gap against the -128 currently on the board. That’s the kind of model-versus-market spread that sharp bettors look for. Siri’s speed and aggressive approach at the plate mean even weak contact regularly turns into scored runs or RBI opportunities, and against a Brewers pitching staff that hasn’t been immune to giving up traffic on the bases, the model’s confidence here looks well-founded.

Mickey Moniak Over 1.5 Total Bases vs. Royals (-119)

Moniak has quietly turned into one of the more dangerous power bats in Colorado’s lineup, batting .278 with 17 home runs, 46 RBIs, and a .567 slugging percentage in 209 at-bats this season — an .900 OPS that ranks him among the more productive outfielders in the league on a per-at-bat basis. Over his last 15 games he’s hitting .286 with three homers and a .551 slugging mark, and he delivered a five-at-bat, two-hit, one-homer, three-RBI performance as recently as July 28 against San Diego.

Coors Field remains one of the most favorable offensive environments in baseball, and Moniak gets to play his home games there against a Royals pitching staff that ranks near the bottom of the league in ERA. His extra-base rate away from Coors is still strong, but at home the thin air simply amplifies contact into extra bases more often than not. Given his power output, a single extra-base hit clears this number outright, and even a two-single night gets there — that combination of power and contact frequency makes -119 a fair price to back.

Today’s Edge

All three of these props lean on a specific data point rather than a hot streak alone — Witt’s extra-base volume, Siri’s model-market gap, and Moniak’s Coors Field power profile. Check current odds at your DraftKings promo code book before locking anything in, since lines can move closer to first pitch.

• Bobby Witt Jr. OVER 1.5 Total Bases (-103)
• Jose Siri OVER 0.5 Hits+Runs+RBIs (-128)
• Mickey Moniak OVER 1.5 Total Bases (-119)

Each pick stands on its own data, but stacked together they represent three of the sharper batter prop angles on tonight’s board.