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Best bets today: Diamondbacks vs. Padres among SportsLine's top MLB plays, predictions for July 9

It's a strong 15-game MLB slate on Wednesday, including the Diamondbacks and Padres meeting for the third time in their four-game set after splitting the first two games

ByUpdated: Jul 09, 2025 3:04PM UTC . 4 min read

Bettors have a full slate of 15 MLB games to choose from on Wednesday, July 9. The featured games pit the Seattle Mariners against the New York Yankees, while the Arizona Diamondbacks and San Diego Padres battle in the third game of their four-game series. 

We highlight the top betting opportunities with links to full game analysis and picks throughout the article while providing the top betting tips for today's matchups.

There is also a link to the best sportsbook promotion today from FanDuel Sportsbook. FanDuel offers new users a "bet $5, get $150" bonus if your first bet wins. No promo code required. See more about the offer below. 

Best MLB bets today

Seattle Mariners at New York Yankees (-160, 9.5): 7:05 p.m. ET

The Yankees start to July was rough, with the Bronx Bombers dropping six straight games. However, New York has now won two in a row after defeating Seattle 10-3 on Tuesday.

If the Yankees' winning streak is going to reach three, they will need a big effort out of Cam Schlittler in his MLB debut. New York is dealing with injuries to its rotation and promoted Schlittler to the active roster. The 24-year-old started 14 games in Double and Triple A this season, posting a 3.52 ERA. 

The Mariners counter with Logan Evans. It's a rare time when Evans will be considered the veteran in a pitching matchup this season. Like Schlittler, Evans is a 24-year-old rookie, although he has started eight games this season. Evans has been a pleasant surprise for Seattle, posting a 2.96 ERA and allowing three runs or less in five of eight starts. 

Arizona Diamondbacks at San Diego Padres (-140, 8): 9:40 p.m. ET

The Padres evened their series with Arizona after winning a pitcher's duel Tuesday night, 1-0. It was the second time in the last three games that the Diamondbacks were shut out.

Brandon Pfaadt gets the call for Arizona. It's been a rough stretch for Pfaadt. The Diamondbacks have lost his last four starts, and in those outings, Pfaadt has allowed 13 runs over 21 innings. Things might not get any better for Pfaadt on Wednesday. San Diego's current lineup is hitting .349 in 86 career at-bats against him. 

The Padres give the ball to Dylan Cease. Cease has gotten lit up in his last two starts, allowing 13 hits and eight runs in 10 innings of work. Cease has had success against Arizona in his career, holding current Diamondbacks batters to a .211 average in 71 career plate appearances. 

Today's featured sportsbook promo

FanDuel Sportsbook offers new customers the ability to deposit as little as $5 and then make a first bet of at least $5. New users will receive $150 in bonus bets if their first bet wins. Plus, there are no minimum odds required, and the first wager can be made on any sport or market. So you can bet $5 on the biggest favorite you can find, and if it wins, you'll still receive $150 in bonus bets. 

Bonus bets cannot be cashed out and must be wagered within the following seven days, or they will expire. In addition to the bonus bets, any winning first bet earns the customer their winnings in cash. 

For example, let's say you bet $10 on New York to beat Seattle tonight in MLB, and the Yankees win. You will receive your $10 back plus winnings from the bet in cash. FanDuel will also give you $150 in bonus bets. Bonus bets are not included in any cash winnings.

Other games to bet on for Wednesday, July 9

Over at SportsLine, you'll get top-notch analysis, including game breakdowns, betting trends, predictions, and expert advice on all the MLB games slated for Wednesday, July 9. You can also join the SportsLine Discord channel for even more betting tips and expert picks.

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