MLB Betting Promos: Claim Thousands in Bonus Value for Astros vs. Padres, Sunday Night Baseball

Sunday's MLB schedule runs from a Peacock leadoff to a primetime finale, and the best MLB betting promos are open to anyone who registers before the day's marquee broadcasts.

Peacock opens the slate with Reds vs. Nationals at 12:15 p.m. ET, and NBC closes it with the main event: Astros vs. Padres for Sunday Night Baseball at 8:20 p.m. ET from Petco Park.

Open accounts across the MLB betting promos listed below that provide north of $3,000 in combined welcome value — bonus-bet drops, first-bet insurance, and bet-and-get offers — all of which can be aimed at the Sunday Night Baseball headliner or anything else on the board.

Astros vs. Padres MLB Odds & Picks

Astros vs. Padres prediction: Padres moneyline (-115)

San Diego holds home-field for the Sunday Night Baseball headliner and sits as the slim favorite at Petco Park, which is enough to prefer the moneyline over a total in the mid-8s. Petco is one of the more pitcher-friendly parks in the game, so if you'd rather trade the run environment than a side, the under is a defensible second angle. Either way, lock in the starters first, then let a bonus bet ride the nightcap.

Best MLB Betting Promos for Sunday, August 9

Every offer below has been checked against Sunday's board. Here's what you get, what it costs to trigger, and the code that unlocks it.

1. Fanatics Sportsbook

The Fanatics Sportsbook promo code fronts new users a $1,000 Bet Match spread across ten straight days of betting, making it the offer built for volume rather than one big swing. Lose a wager on any given day and Fanatics returns it as FanCash, so the cushion refreshes daily. That makes it the offer to lean on through a full Sunday slate instead of burning out on a single qualifier.

2. BetMGM Sportsbook

The BetMGM bonus code TOPACTION carries the biggest headline number on today's list: $1,500 of coverage on your opening wager. Put it on the Padres under the NBC lights, a Reds-Nationals total, or anything else on the card. If the bet misses, BetMGM refunds the stake in bonus bets up to $1,500 — and the bigger your first wager, the more of that ceiling you actually put to use.

3. bet365 Sportsbook

There's no bet365 bonus code to type — the offer attaches when you register through the link. The terms are about as straightforward as MLB betting promos get: put $10 on any Sunday market and $150 in bonus bets follows whether the wager wins or loses. Stick it on the Padres, a Reds-Nationals under, or a game nobody's televising; the result doesn't change the payout.

4. DraftKings Sportsbook

The DraftKings promo code needs nothing but the link, and it asks for the smallest buy-in on this page: $5 on any market returns $150 in bonus bets, credited immediately rather than after the game settles. For anyone who just wants bankroll in the account before the 12:15 p.m. ET leadoff on Peacock, this is the fastest of Sunday's MLB betting promos to convert.

5. FanDuel Sportsbook

No FanDuel promo code is needed here either, and the structure spreads your coverage across five days instead of one. Bet $5 a day, and any losing qualifier comes back as a reset worth up to $200, to a $1,000 total. If your betting is a few dollars a night through a weekend series rather than one meaningful wager, this is the shape that fits.

6. theScore Bet

theScore Bet promo code ACTNEWS unlocks a $1,000 First Bet Reset: back any market on Sunday's card, and a losing opener is refunded in bonus bets up to a grand. The terms change by state — players in Michigan, New Jersey, Pennsylvania, and West Virginia get a Bet $10, Get $100 bet-and-get instead of the reset — so check which version your account qualifies for.

7. betPARX

betPARX promo code TANBONUS puts 100% insurance behind your first wager, refunded as a bonus bet up to $50. It's the smallest number on this page, but it's also a two-minute signup, which makes it a low-effort addition if you're already working through the rest of these MLB betting promos.

8. Hard Rock Bet

9. BetRivers

There si no physical BetRivers bonus code is required, and what you get depends on where you register: a 2nd Chance Bet worth as much as $500 in Michigan and Pennsylvania, scaling down through New Jersey and West Virginia. Lose the opener and it returns as a bonus bet, which keeps you live all the way to the Sunday Night Baseball finale even if an afternoon game doesn't go your way.

10. Borgata

Borgata bonus code ACTION closes out the list of online sportsbook with a New Jersey-specific offer. Bet $20, and get $100 in bonus bets back as soon as the qualifier settles. No win requirement and no waiting period beyond settlement, which makes it a tidy last stop for Garden State bettors stacking Sunday's offers.

MLB Prediction Markets for Today's Slate

Sportsbooks aren't the only way into Sunday's baseball action. Prediction market apps run welcome offers of their own, and their state coverage dwarfs the licensed books — worth knowing if you're reading this from somewhere the sportsbook MLB betting promos above don't reach.

1. Kalshi

Kalshi promo code ACTION pays new traders a bonus of up to $500 once they've traded $25. Kalshi is live in more than 40 states, which puts tonight's Astros-Padres headliner within reach for plenty of people who can't legally open a sportsbook account.

2. Polymarket

Polymarket promo codeACTION is the smaller of the two and the quicker to clear: deposit $10, collect a $20 trading bonus. Coverage again runs past 40 states, so it slots neatly alongside Kalshi at the end of your stack for the Sunday Night Baseball main event.