5-14 MLB Best Bets: Back Astros vs Castillo, Roupp vs Dodgers

Written By:

Zachary Kelley

Published On:

May 14, 2026 11:02 AM

5-14 MLB Best Bets: Back Astros vs Castillo, Roupp vs Dodgers
  • The Houston Astros have great moneyline value (+105) against Luis Castillo and the Seattle Mariners.
  • Yordan Alvarez has +240 odds to hit a homer run off Castillo.
  • Back the San Francisco Giants to win the series finale (+150) against the Los Angeles Dodgers behind starter Landon Roupp.

HOUSTON – The Houston Astros have +105 odds to win against the Seattle Mariners in Thursday’s series finale. With a significant pitching mismatch against Seattle starter Luis Castillo, the Astros are a valuable underdog at legal MLB betting sites in the afternoon slate.

Mariners vs Astros Betting Lines

TeamRunlineMoneylineTotal
Seattle Mariners-1.5 (+130)-125O9.0 (-120)
Houston Astros+1.5 (-150)+105U9.0 (+100)

Luis Castillo has yet to earn a win this season, posting an 0-4 start with a 6.57 ERA. The Astros have lost five straight Castillo starts and he’s surrendered four or more runs in three-consecutive outings.

The Astros put up seven runs on 10 hits when they faced Castillo earlier this season, giving more confidence towards their +105 Texas sports betting odds on the moneyline. Yordan Alvarez is worth a shot to hit a home run at +240 odds since he is 9/19 with three homers in 21 career plate appearances against Castillo.

Back Landon Roupp, Giants (+150) to Close Series Vs Dodgers

In a late-night battle between the San Francisco Giants and theLos Angeles Dodgers, California sports betting odds favor the Dodgers at -182 moneyline odds. However, this Dodgers lineup willcontinue their struggles against Giants’ starter Landon Roupp.

The data from Landon Roupp’s Baseball Savant page back up his strong start, showing that Roupp’s 98th-percentile barrel % and hard-hit % contribute to an expected batting average of .198. Wednesday night’s 4-0 win for LA was the first time they scored more than three runs since May 6, so Roupp can take advantage of a struggling Dodgers lineup with +150 odds.

Giants vs Dodgers Betting Lines

TeamRunlineMoneylineTotal
San Francisco Giants+1.5 (-130)+150O8.5 (+100)
Los Angeles Dodgers-1.5 (+110)-182U8.5 (-120)

On the other hand, San Francisco’s lineup has been hot with six or more runs scored in three of their last four games. Before last night’s shutout, the Giants cleared their legal sports betting run total in the first two games of the series with six and nine runs scored, respectively.

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Ben Fiore

Zachary Kelley

Zach graduated from Florida State University with a degree in Writing, Editing, and Media. Zach is interested in the legalization aspect of sports betting and enjoys participating in DFS. He has a passion for sports writing and most enjoys writing about football and baseball both professional and collegiate.