Best MLB prop bets March 31: Back stars Fernando Tatis Jr. and Mike Trout on Monday night

MLB prop bets

Los Angeles Angels star Mike Trout headlines Monday’s top MLB prop picks.

The pregame narrative: Trout has been quiet to start the 2025 season, but he’s healthy and enjoys a plus matchup against the St. Louis Cardinals tonight. In addition to Trout, I have a play on Fernando Tatis Jr.

Check out how I’m betting on the duo in the best MLB prop bets for Monday, March 31.

MLB prop bets

Best bet: Trout over 1.5 total bases (+123)

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I’ve recommended Trout on this market this season and that obviously didn’t cash, evidenced by his one hit (none for extra bases) through three games. 

Two things: I’m not making any overreactions this early. That said, I’ve accepted he’s no longer MVP Trout. 

But Trout remains a huge power threat, leading to great early value on his props. 

He’s been plus money on this market every game of the season. 

I don’t believe Trout should be priced anywhere near this high against a low-strikeout arm in Miles Mikolas, who gave up more contact than any qualified pitcher last season (per FanGraphs). 

Trout tore the cover off the ball in spring (three homers, 1.026 OPS) and hit for power in the limited time he was on the field over the last two seasons (.504 slugging).

Key stat: Mikolas had a 5.35 ERA and bottom 10th percentile K rate over 32 starts last season.

Best MLB picks

Tatis over 0.5 runs (-112): This isn’t the same plus-money value like the Trout recommendation, but consider this a good price for an ultra-dangerous hitter.

Tatis has five runs in four games, hitting .467/.529/.733 over the San Diego Padres’ four-game sweep of the Atlanta Braves. He struck out just once.

The dynamic outfielder is coming off an electric postseason (four homers, 1.500 OPS) and hits leadoff for a deep Padres team.

San Diego has big weapons that follow Tatis, whose Padres see Luis Ortiz of the Cleveland Guardians.

Ortiz had a 3.32 ERA with the Pittsburgh Pirates last season, but his xERA was a full run higher and he’s had below-average K rates over the last two seasons.

The 26-year-old was repeatedly pounded in spring training.

MLB prop picks made at 3:40 p.m. ET on 03/31/25.

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Chris joined NorthStar Gaming from Covers.com where he was a publishing editor and wrote betting content. Before that, he was the sports editor at VICE Canada, worked for theScore and covered the Blue Jays for MLB.com. In addition to filling out the lineup card each day for the editorial team, Chris writes frequently himself, primarily on the NBA and MLB.