MLB Betting Promos: Odds & Picks for Today’s Games (Saturday, August 1)

The best MLB betting promos are lining up for a loaded Saturday slate headlined by three national TV games — Twins vs. Mariners at 4:10 p.m. ET on FS1, followed by a FOX doubleheader at 7:15 p.m. ET with Diamondbacks vs. Guardians at Progressive Field and Yankees vs. Cubs at Wrigley Field. New bettors who sign up before first pitch can stack more than $3,000 in combined welcome bonuses across the top sportsbooks and betting sites, with bonus bets, first-bet safety nets, and bet-and-get offers all applying to today's games.

Below we've rounded up the top MLB betting promos available for Saturday, broken down exactly what each one gives you, and walked through how to lock them in. Every offer here is for first-time customers who are 21 or older and located in a legal betting state, and they can all be used on today's three key games or any other spot on the full MLB slate.

Saturday MLB Odds for Key Games

Here are the latest lines for today's three national TV games. All odds are subject to movement before first pitch — check the top MLB betting promos above for the best sign-up value before locking in a wager.

Twins vs. Mariners — 4:10 p.m. ET, FS1, T-Mobile Park

Diamondbacks vs. Guardians — 7:15 p.m. ET, FOX, Progressive Field

Yankees vs. Cubs — 7:15 p.m. ET, FOX, Wrigley Field

All odds subject to change. Verify before placing any wager.

Saturday MLB Picks

Here are my favorite picks for Saturday's MLB slate:

• Mariners moneyline (-125) — Twins vs. Mariners, 4:10 p.m. ET, FS1. Seattle holds home-field advantage at T-Mobile Park, one of the AL's more pitcher-friendly environments, and carries a .382 OBP and .288 batting average into today's FS1 opener. Minnesota arrives as a road underdog with a .271 batting average — a meaningful gap in contact quality that the market reflects with Seattle as a moderate home favorite. The Under 8 runs at the same venue is the natural complement.
• Diamondbacks moneyline (+130) — Diamondbacks vs. Guardians, 7:15 p.m. ET, FOX. Arizona arrives as a road underdog with genuine value behind it. The D-backs are 4-0 in their last four road games and 5-1 in the last six meetings overall against Cleveland. Their .248 team batting average and .414 SLG give them enough offensive output to win on the road against a Guardians club that is 3-7 over its last ten games. Taking Arizona at plus money against a team on a cold stretch is today's best value play on the FOX card.
• Cubs moneyline (-140) — Yankees vs. Cubs, 7:15 p.m. ET, FOX. Chicago holds home-field advantage at Wrigley Field with a .290 team batting average and .388 OBP — both ahead of the Yankees' .273 and .360 respectively. The Under 8.5 is the structural lean given it has hit in five of the last six meetings between these clubs. Back Chicago at home on the national FOX broadcast tonight.

Best MLB Betting Promos for Saturday, August 1

Below is information about the top MLB betting promos you can claim ahead of today's three-game national TV slate.

Fanatics Sportsbook Promo Code ACTION26

The Fanatics Sportsbook promo code ACTION26 unlocks a Bet and Get offer that reaches up to $1,000 in FanCash. New users get a matched No Sweat Bet each day for a set stretch of up to $100 per day over 10 days, and each losing wager is refunded in FanCash. Spread across the run that adds up to as much as $1,000 in coverage.

This is one of the MLB betting promos that fits daily bettors well, since it rewards you for coming back each day rather than requiring one large qualifying bet. Saturday's three-game national TV slate is a strong spot to kick off the sequence.

BetMGM Bonus Code ACTION1550

The BetMGM bonus code ACTION1550 delivers a First Bet Offer worth up to $1,500 in bonus bets, along with $50 in BetMGM Reward Points. Sign up, make a qualifying deposit, and place your opening wager — if it wins you keep the cash; if it loses, BetMGM refunds the stake in bonus bets up to $1,500. Larger first bets on today's games are covered by the full amount, which makes this appealing for bettors who want to swing bigger on the Mariners, Cubs, or Diamondbacks.

Confirm the bonus code attached to your BetMGM promo before you register, as specific codes vary in welcome offer and by location.

bet365 Bonus Code

The bet365 bonus code unlocks a Bet $10, Get $150 in Bonus Bets welcome offer — one of the most straightforward MLB betting promos in the market because the bonus lands no matter what your first bet does. Put down a $10 wager on today's Mariners, Guardians, or Cubs moneyline and bet365 credits $150 in bonus bets regardless of whether that opening ticket wins or loses.

That win-or-lose structure is what sets this apart from standard bet-and-get offers. The $150 in bonus bets can be spread across any markets bet365 offers, including run lines, totals, and player props across all three national TV games today.

DraftKings Promo Code

DraftKings is running a Bet $5, Get $150 in Bonus Bets offer, and no physical DraftKings promo code is required — the deal applies automatically when you sign up through our qualifying link. Deposit at least $5, place a $5 wager on any market priced at -500 odds or longer, and $150 in bonus bets hits your account immediately.

This DraftKings promo pays out win or lose, which keeps the risk low for new users. A $5 moneyline bet on the Cubs at Wrigley or the Guardians at Progressive Field is all it takes to trigger the full $150 in bonus bets with one of the most accessible MLB betting promos on the board today.

FanDuel Promo Code

FanDuel takes a different approach with its welcome offer, and no FanDuel promo code is needed to activate the bonus. New users can bet $5 per day for five straight days and collect up to $1,000 in bet resets. Each day your $5 qualifying wager loses, FanDuel refunds you up to $200 in bet resets, so the safety net can total as much as $1,000 across the week.

That makes this one of the more flexible MLB betting promos for daily baseball bettors. Start with today's FOX doubleheader and keep the offer rolling through the Sunday slate, giving yourself insurance on five separate days of action.

Hard Rock Bet Promo Code

Hard Rock Bet keeps things simple. Sign up, deposit, and place a first wager of at least $5 on any of today's three national TV games. If that opening bet wins, the Hard Rock Bet promo code credits $150 in bonus bets, delivered as six $25 bonus bets you can spread across future games.

The qualifying bet must win to unlock the $150 — this is a bet-and-get offer rather than a safety net. Many bettors point a modest $5 wager at a shorter-priced home favorite like the Cubs or Guardians to give the qualifying ticket the best shot at cashing.

theScore Bet Promo Code ACTNEWS

The theScore Bet promo code ACTNEWS offers a First Bet Reset worth up to $1,000. Place your opening cash wager on any market, and if it loses, theScore Bet refunds your full stake in bonus bets. The reset is issued as five separate bonus bets, each worth 20% of your losing stake — multiple chances to turn the insurance into real winnings across today's full MLB slate.

Kalshi Promo Code ACTION

Kalshi is a CFTC-regulated prediction market rather than a traditional sportsbook, which means users trade contracts on real-world outcomes including all three of today's national TV games. The Kalshi promo codeACTION welcome offer works differently from the MLB betting promos above: trade $25 across any markets and Kalshi credits a randomized bonus worth up to $500 once you clear that threshold.

The bonus lands after your first $25 in trades is submitted, and it isn't tied to whether those trades win or lose. Put it toward Mariners vs. Twins contracts, a Cubs moneyline position, or the Diamondbacks to win at Progressive Field — all three games are live on Kalshi right now.

Polymarket Promo Code ACTION

Polymarket, the largest prediction market in the world, returned to U.S. traders after gaining CFTC clearance and acquiring a regulated exchange in late 2025. The Polymarket promo code ACTION is open to eligible users 18 and up and deals in event contracts rather than sportsbook-style bets. The current welcome offer requires a qualifying deposit of at least $10, and $20 in trading credit gets added to your balance automatically.

The $20 bonus is issued as non-withdrawable trading credit, though any profits you earn using it can be cashed out. Put those funds toward any of today's three MLB games or a wide range of politics, economics, and entertainment contracts on the platform.